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// 
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// 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.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.Collection;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Supplier;
import javax.servlet.AsyncContext;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.http.CompressedContentFormat;
import org.eclipse.jetty.http.DateParser;
import org.eclipse.jetty.http.HttpContent;
import org.eclipse.jetty.http.HttpField;
import org.eclipse.jetty.http.HttpFields;
import org.eclipse.jetty.http.HttpHeader;
import org.eclipse.jetty.http.PreEncodedHttpField;
import org.eclipse.jetty.http.QuotedCSV;
import org.eclipse.jetty.http.QuotedQualityCSV;
import org.eclipse.jetty.io.WriterOutputStream;
import org.eclipse.jetty.server.resource.HttpContentRangeWriter;
import org.eclipse.jetty.server.resource.RangeWriter;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.MultiPartOutputStream;
import org.eclipse.jetty.util.URIUtil;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.resource.Resource;
import static java.util.Arrays.stream;
import static java.util.Collections.emptyList;
import static org.eclipse.jetty.http.HttpHeaderValue.IDENTITY;

/**
 *  Abstract resource service, used by DefaultServlet and ResourceHandler
 *
 * @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
 */
@Deprecated(since = "2021-05-27")
public class ResourceService {

    private static final Logger LOG = Log.getLogger(ResourceService.class);

    private static final PreEncodedHttpField ACCEPT_RANGES = new PreEncodedHttpField(HttpHeader.ACCEPT_RANGES, "bytes");

    private HttpContent.ContentFactory _contentFactory;

    private WelcomeFactory _welcomeFactory;

    private boolean _acceptRanges = true;

    private boolean _dirAllowed = true;

    private boolean _redirectWelcome = false;

    private CompressedContentFormat[] _precompressedFormats = new CompressedContentFormat[0];

    private String[] _preferredEncodingOrder = new String[0];

    private final Map> _preferredEncodingOrderCache = new ConcurrentHashMap<>();

    private int _encodingCacheSize = 100;

    private boolean _pathInfoOnly = false;

    private boolean _etags = false;

    private HttpField _cacheControl;

    private List _gzipEquivalentFileExtensions;

    public HttpContent.ContentFactory getContentFactory() {
        return _contentFactory;
    }

    public void setContentFactory(HttpContent.ContentFactory contentFactory) {
        _contentFactory = contentFactory;
    }

    public WelcomeFactory getWelcomeFactory() {
        return _welcomeFactory;
    }

    public void setWelcomeFactory(WelcomeFactory welcomeFactory) {
        _welcomeFactory = welcomeFactory;
    }

    public boolean isAcceptRanges() {
        return _acceptRanges;
    }

    public void setAcceptRanges(boolean acceptRanges) {
        _acceptRanges = acceptRanges;
    }

    public boolean isDirAllowed() {
        return _dirAllowed;
    }

    public void setDirAllowed(boolean dirAllowed) {
        _dirAllowed = dirAllowed;
    }

    public boolean isRedirectWelcome() {
        return _redirectWelcome;
    }

    public void setRedirectWelcome(boolean redirectWelcome) {
        _redirectWelcome = redirectWelcome;
    }

    public CompressedContentFormat[] getPrecompressedFormats() {
        return _precompressedFormats;
    }

    public void setPrecompressedFormats(CompressedContentFormat[] precompressedFormats) {
        _precompressedFormats = precompressedFormats;
        _preferredEncodingOrder = stream(_precompressedFormats).map(f -> f.getEncoding()).toArray(String[]::new);
    }

    public void setEncodingCacheSize(int encodingCacheSize) {
        _encodingCacheSize = encodingCacheSize;
    }

    public int getEncodingCacheSize() {
        return _encodingCacheSize;
    }

    public boolean isPathInfoOnly() {
        return _pathInfoOnly;
    }

    public void setPathInfoOnly(boolean pathInfoOnly) {
        _pathInfoOnly = pathInfoOnly;
    }

    public boolean isEtags() {
        return _etags;
    }

    public void setEtags(boolean etags) {
        _etags = etags;
    }

    public HttpField getCacheControl() {
        return _cacheControl;
    }

    public void setCacheControl(HttpField cacheControl) {
        if (cacheControl == null)
            _cacheControl = null;
        if (cacheControl.getHeader() != HttpHeader.CACHE_CONTROL)
            throw new IllegalArgumentException("!Cache-Control");
        _cacheControl = cacheControl instanceof PreEncodedHttpField ? cacheControl : new PreEncodedHttpField(cacheControl.getHeader(), cacheControl.getValue());
    }

    public List getGzipEquivalentFileExtensions() {
        return _gzipEquivalentFileExtensions;
    }

    public void setGzipEquivalentFileExtensions(List gzipEquivalentFileExtensions) {
        _gzipEquivalentFileExtensions = gzipEquivalentFileExtensions;
    }

    public boolean doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String servletPath = null;
        String pathInfo = null;
        Enumeration reqRanges = null;
        boolean included = request.getAttribute(RequestDispatcher.INCLUDE_REQUEST_URI) != null;
        if (included) {
            servletPath = _pathInfoOnly ? "/" : (String) request.getAttribute(RequestDispatcher.INCLUDE_SERVLET_PATH);
            pathInfo = (String) request.getAttribute(RequestDispatcher.INCLUDE_PATH_INFO);
            if (servletPath == null) {
                servletPath = request.getServletPath();
                pathInfo = request.getPathInfo();
            }
        } else {
            servletPath = _pathInfoOnly ? "/" : request.getServletPath();
            pathInfo = request.getPathInfo();
            // Is this a Range request?
            reqRanges = request.getHeaders(HttpHeader.RANGE.asString());
            if (!hasDefinedRange(reqRanges))
                reqRanges = null;
        }
        String pathInContext = URIUtil.addPaths(servletPath, pathInfo);
        boolean endsWithSlash = (pathInfo == null ? (_pathInfoOnly ? "" : servletPath) : pathInfo).endsWith(URIUtil.SLASH);
        boolean checkPrecompressedVariants = _precompressedFormats.length > 0 && !endsWithSlash && !included && reqRanges == null;
        HttpContent content = null;
        boolean releaseContent = true;
        try {
            // Find the content
            content = _contentFactory.getContent(pathInContext, response.getBufferSize());
            if (LOG.isDebugEnabled())
                LOG.debug("content={}", content);
            // Not found?
            if (content == null || !content.getResource().exists()) {
                if (included)
                    throw new FileNotFoundException("!" + pathInContext);
                notFound(request, response);
                return response.isCommitted();
            }
            // Directory?
            if (content.getResource().isDirectory()) {
                sendWelcome(content, pathInContext, endsWithSlash, included, request, response);
                return true;
            }
            // Strip slash?
            if (!included && endsWithSlash && pathInContext.length() > 1) {
                String q = request.getQueryString();
                pathInContext = pathInContext.substring(0, pathInContext.length() - 1);
                if (q != null && q.length() != 0)
                    pathInContext += "?" + q;
                response.sendRedirect(response.encodeRedirectURL(URIUtil.addPaths(request.getContextPath(), pathInContext)));
                return true;
            }
            // Conditional response?
            if (!included && !passConditionalHeaders(request, response, content))
                return true;
            // Precompressed variant available?
            Map precompressedContents = checkPrecompressedVariants ? content.getPrecompressedContents() : null;
            if (precompressedContents != null && precompressedContents.size() > 0) {
                // Tell caches that response may vary by accept-encoding
                response.addHeader(HttpHeader.VARY.asString(), HttpHeader.ACCEPT_ENCODING.asString());
                List preferredEncodings = getPreferredEncodingOrder(request);
                CompressedContentFormat precompressedContentEncoding = getBestPrecompressedContent(preferredEncodings, precompressedContents.keySet());
                if (precompressedContentEncoding != null) {
                    HttpContent precompressedContent = precompressedContents.get(precompressedContentEncoding);
                    if (LOG.isDebugEnabled())
                        LOG.debug("precompressed={}", precompressedContent);
                    content = precompressedContent;
                    response.setHeader(HttpHeader.CONTENT_ENCODING.asString(), precompressedContentEncoding.getEncoding());
                }
            }
            // TODO this should be done by HttpContent#getContentEncoding
            if (isGzippedContent(pathInContext))
                response.setHeader(HttpHeader.CONTENT_ENCODING.asString(), "gzip");
            // Send the data
            releaseContent = sendData(request, response, included, content, reqRanges);
        } catch (IllegalArgumentException e) {
            LOG.warn(Log.EXCEPTION, e);
            if (!response.isCommitted())
                response.sendError(500, e.getMessage());
        } finally {
            if (releaseContent) {
                if (content != null)
                    content.release();
            }
        }
        return true;
    }

    private List getPreferredEncodingOrder(HttpServletRequest request) {
        Enumeration headers = request.getHeaders(HttpHeader.ACCEPT_ENCODING.asString());
        if (!headers.hasMoreElements())
            return emptyList();
        String key = headers.nextElement();
        if (headers.hasMoreElements()) {
            StringBuilder sb = new StringBuilder(key.length() * 2);
            sb.append(key);
            do {
                sb.append(',').append(headers.nextElement());
            } while (headers.hasMoreElements());
            key = sb.toString();
        }
        List values = _preferredEncodingOrderCache.get(key);
        if (values == null) {
            QuotedQualityCSV encodingQualityCSV = new QuotedQualityCSV(_preferredEncodingOrder);
            encodingQualityCSV.addValue(key);
            values = encodingQualityCSV.getValues();
            // keep cache size in check even if we get strange/malicious input
            if (_preferredEncodingOrderCache.size() > _encodingCacheSize)
                _preferredEncodingOrderCache.clear();
            _preferredEncodingOrderCache.put(key, values);
        }
        return values;
    }

    private CompressedContentFormat getBestPrecompressedContent(List preferredEncodings, Collection availableFormats) {
        if (availableFormats.isEmpty())
            return null;
        for (String encoding : preferredEncodings) {
            for (CompressedContentFormat format : availableFormats) {
                if (format.getEncoding().equals(encoding))
                    return format;
            }
            if ("*".equals(encoding))
                return availableFormats.iterator().next();
            if (IDENTITY.asString().equals(encoding))
                return null;
        }
        return null;
    }

    protected void sendWelcome(HttpContent content, String pathInContext, boolean endsWithSlash, boolean included, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // Redirect to directory
        if (!endsWithSlash) {
            StringBuilder buf = new StringBuilder(request.getRequestURI());
            int param = buf.lastIndexOf(";");
            if (param < 0 || buf.lastIndexOf("/", param) > 0)
                buf.append('/');
            else
                buf.insert(param, '/');
            String q = request.getQueryString();
            if (q != null && q.length() != 0) {
                buf.append('?');
                buf.append(q);
            }
            response.setContentLength(0);
            response.sendRedirect(response.encodeRedirectURL(buf.toString()));
            return;
        }
        // look for a welcome file
        String welcome = _welcomeFactory == null ? null : _welcomeFactory.getWelcomeFile(pathInContext);
        if (welcome != null) {
            String servletPath = included ? (String) request.getAttribute(RequestDispatcher.INCLUDE_SERVLET_PATH) : request.getServletPath();
            if (_pathInfoOnly)
                welcome = URIUtil.addPaths(servletPath, welcome);
            if (LOG.isDebugEnabled())
                LOG.debug("welcome={}", welcome);
            ServletContext context = request.getServletContext();
            if (_redirectWelcome || context == null) {
                // Redirect to the index
                response.setContentLength(0);
                String uri = URIUtil.encodePath(URIUtil.addPaths(request.getContextPath(), welcome));
                String q = request.getQueryString();
                if (q != null && !q.isEmpty())
                    uri += "?" + q;
                response.sendRedirect(response.encodeRedirectURL(uri));
                return;
            }
            RequestDispatcher dispatcher = context.getRequestDispatcher(URIUtil.encodePath(welcome));
            if (dispatcher != null) {
                // Forward to the index
                if (included)
                    dispatcher.include(request, response);
                else {
                    request.setAttribute("org.eclipse.jetty.server.welcome", welcome);
                    dispatcher.forward(request, response);
                }
            }
            return;
        }
        if (included || passConditionalHeaders(request, response, content))
            sendDirectory(request, response, content.getResource(), pathInContext);
    }

    protected boolean isGzippedContent(String path) {
        if (path == null || _gzipEquivalentFileExtensions == null)
            return false;
        for (String suffix : _gzipEquivalentFileExtensions) {
            if (path.endsWith(suffix))
                return true;
        }
        return false;
    }

    private boolean hasDefinedRange(Enumeration reqRanges) {
        return (reqRanges != null && reqRanges.hasMoreElements());
    }

    protected void notFound(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.sendError(HttpServletResponse.SC_NOT_FOUND);
    }

    protected void sendStatus(HttpServletResponse response, int status, Supplier etag) throws IOException {
        response.setStatus(status);
        if (_etags && etag != null)
            response.setHeader(HttpHeader.ETAG.asString(), etag.get());
        response.flushBuffer();
    }

    /* Check modification date headers.
     */
    protected boolean passConditionalHeaders(HttpServletRequest request, HttpServletResponse response, HttpContent content) throws IOException {
        try {
            String ifm = null;
            String ifnm = null;
            String ifms = null;
            long ifums = -1;
            if (request instanceof Request) {
                // Find multiple fields by iteration as an optimization
                HttpFields fields = ((Request) request).getHttpFields();
                for (int i = fields.size(); i-- > 0; ) {
                    HttpField field = fields.getField(i);
                    if (field.getHeader() != null) {
                        switch(field.getHeader()) {
                            case IF_MATCH:
                                ifm = field.getValue();
                                break;
                            case IF_NONE_MATCH:
                                ifnm = field.getValue();
                                break;
                            case IF_MODIFIED_SINCE:
                                ifms = field.getValue();
                                break;
                            case IF_UNMODIFIED_SINCE:
                                ifums = DateParser.parseDate(field.getValue());
                                break;
                            default:
                        }
                    }
                }
            } else {
                ifm = request.getHeader(HttpHeader.IF_MATCH.asString());
                ifnm = request.getHeader(HttpHeader.IF_NONE_MATCH.asString());
                ifms = request.getHeader(HttpHeader.IF_MODIFIED_SINCE.asString());
                ifums = request.getDateHeader(HttpHeader.IF_UNMODIFIED_SINCE.asString());
            }
            if (_etags) {
                String etag = content.getETagValue();
                if (ifm != null) {
                    boolean match = false;
                    if (etag != null) {
                        QuotedCSV quoted = new QuotedCSV(true, ifm);
                        for (String etagWithSuffix : quoted) {
                            if (CompressedContentFormat.tagEquals(etag, etagWithSuffix)) {
                                match = true;
                                break;
                            }
                        }
                    }
                    if (!match) {
                        sendStatus(response, HttpServletResponse.SC_PRECONDITION_FAILED, null);
                        return false;
                    }
                }
                if (ifnm != null && etag != null) {
                    // Handle special case of exact match OR gzip exact match
                    if (CompressedContentFormat.tagEquals(etag, ifnm) && ifnm.indexOf(',') < 0) {
                        sendStatus(response, HttpServletResponse.SC_NOT_MODIFIED, ifnm::toString);
                        return false;
                    }
                    // Handle list of tags
                    QuotedCSV quoted = new QuotedCSV(true, ifnm);
                    for (String tag : quoted) {
                        if (CompressedContentFormat.tagEquals(etag, tag)) {
                            sendStatus(response, HttpServletResponse.SC_NOT_MODIFIED, tag::toString);
                            return false;
                        }
                    }
                    // If etag requires content to be served, then do not check if-modified-since
                    return true;
                }
            }
            // Handle if modified since
            if (ifms != null) {
                // Get jetty's Response impl
                String mdlm = content.getLastModifiedValue();
                if (ifms.equals(mdlm)) {
                    sendStatus(response, HttpServletResponse.SC_NOT_MODIFIED, content::getETagValue);
                    return false;
                }
                long ifmsl = request.getDateHeader(HttpHeader.IF_MODIFIED_SINCE.asString());
                if (ifmsl != -1 && content.getResource().lastModified() / 1000 <= ifmsl / 1000) {
                    sendStatus(response, HttpServletResponse.SC_NOT_MODIFIED, content::getETagValue);
                    return false;
                }
            }
            // Parse the if[un]modified dates and compare to resource
            if (ifums != -1 && content.getResource().lastModified() / 1000 > ifums / 1000) {
                response.sendError(HttpServletResponse.SC_PRECONDITION_FAILED);
                return false;
            }
        } catch (IllegalArgumentException iae) {
            if (!response.isCommitted())
                response.sendError(400, iae.getMessage());
            throw iae;
        }
        return true;
    }

    protected void sendDirectory(HttpServletRequest request, HttpServletResponse response, Resource resource, String pathInContext) throws IOException {
        if (!_dirAllowed) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN);
            return;
        }
        byte[] data = null;
        String base = URIUtil.addEncodedPaths(request.getRequestURI(), URIUtil.SLASH);
        String dir = resource.getListHTML(base, pathInContext.length() > 1, request.getQueryString());
        if (dir == null) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN, "No directory");
            return;
        }
        data = dir.getBytes(StandardCharsets.UTF_8);
        response.setContentType("text/html;charset=utf-8");
        response.setContentLength(data.length);
        response.getOutputStream().write(data);
    }

    protected boolean sendData(HttpServletRequest request, HttpServletResponse response, boolean include, final HttpContent content, Enumeration reqRanges) throws IOException {
        final long content_length = content.getContentLengthValue();
        // Get the output stream (or writer)
        OutputStream out;
        boolean written;
        try {
            out = response.getOutputStream();
            // has something already written to the response?
            written = !(out instanceof HttpOutput) || ((HttpOutput) out).isWritten();
        } catch (IllegalStateException e) {
            out = new WriterOutputStream(response.getWriter());
            // there may be data in writer buffer, so assume written
            written = true;
        }
        if (LOG.isDebugEnabled())
            LOG.debug(String.format("sendData content=%s out=%s async=%b", content, out, request.isAsyncSupported()));
        if (reqRanges == null || !reqRanges.hasMoreElements() || content_length < 0) {
            // if there were no ranges, send entire entity
            if (include) {
                // write without headers
                content.getResource().writeTo(out, 0, content_length);
            } else // else if we can't do a bypass write because of wrapping
            if (written) {
                // write normally
                putHeaders(response, content, Response.NO_CONTENT_LENGTH);
                ByteBuffer buffer = content.getIndirectBuffer();
                if (buffer != null)
                    BufferUtil.writeTo(buffer, out);
                else
                    content.getResource().writeTo(out, 0, content_length);
            } else // else do a bypass write
            {
                // write the headers
                putHeaders(response, content, Response.USE_KNOWN_CONTENT_LENGTH);
                // write the content asynchronously if supported
                if (request.isAsyncSupported()) {
                    final AsyncContext context = request.startAsync();
                    context.setTimeout(0);
                    ((HttpOutput) out).sendContent(content, new Callback() {

                        @Override
                        public void succeeded() {
                            context.complete();
                            content.release();
                        }

                        @Override
                        public void failed(Throwable x) {
                            if (x instanceof IOException)
                                LOG.debug(x);
                            else
                                LOG.warn(x);
                            context.complete();
                            content.release();
                        }

                        @Override
                        public InvocationType getInvocationType() {
                            return InvocationType.NON_BLOCKING;
                        }

                        @Override
                        public String toString() {
                            return String.format("ResourceService@%x$CB", ResourceService.this.hashCode());
                        }
                    });
                    return false;
                }
                // otherwise write content blocking
                ((HttpOutput) out).sendContent(content);
            }
        } else {
            // Parse the satisfiable ranges
            List ranges = InclusiveByteRange.satisfiableRanges(reqRanges, content_length);
            // if there are no satisfiable ranges, send 416 response
            if (ranges == null || ranges.size() == 0) {
                putHeaders(response, content, Response.USE_KNOWN_CONTENT_LENGTH);
                response.setHeader(HttpHeader.CONTENT_RANGE.asString(), InclusiveByteRange.to416HeaderRangeString(content_length));
                sendStatus(response, HttpServletResponse.SC_REQUESTED_RANGE_NOT_SATISFIABLE, null);
                return true;
            }
            // if there is only a single valid range (must be satisfiable
            // since were here now), send that range with a 216 response
            if (ranges.size() == 1) {
                InclusiveByteRange singleSatisfiableRange = ranges.iterator().next();
                long singleLength = singleSatisfiableRange.getSize();
                putHeaders(response, content, singleLength);
                response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);
                if (!response.containsHeader(HttpHeader.DATE.asString()))
                    response.addDateHeader(HttpHeader.DATE.asString(), System.currentTimeMillis());
                response.setHeader(HttpHeader.CONTENT_RANGE.asString(), singleSatisfiableRange.toHeaderRangeString(content_length));
                content.getResource().writeTo(out, singleSatisfiableRange.getFirst(), singleLength);
                return true;
            }
            // multiple non-overlapping valid ranges cause a multipart
            // 216 response which does not require an overall
            // content-length header
            // 
            putHeaders(response, content, Response.NO_CONTENT_LENGTH);
            String mimetype = content.getContentTypeValue();
            if (mimetype == null)
                LOG.warn("Unknown mimetype for " + request.getRequestURI());
            MultiPartOutputStream multi = new MultiPartOutputStream(out);
            response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);
            if (!response.containsHeader(HttpHeader.DATE.asString()))
                response.addDateHeader(HttpHeader.DATE.asString(), System.currentTimeMillis());
            // If the request has a "Request-Range" header then we need to
            // send an old style multipart/x-byteranges Content-Type. This
            // keeps Netscape and acrobat happy. This is what Apache does.
            String ctp;
            if (request.getHeader(HttpHeader.REQUEST_RANGE.asString()) != null)
                ctp = "multipart/x-byteranges; boundary=";
            else
                ctp = "multipart/byteranges; boundary=";
            response.setContentType(ctp + multi.getBoundary());
            // calculate the content-length
            int length = 0;
            String[] header = new String[ranges.size()];
            int i = 0;
            final int CRLF = "\r\n".length();
            final int DASHDASH = "--".length();
            final int BOUNDARY = multi.getBoundary().length();
            final int FIELD_SEP = ": ".length();
            for (InclusiveByteRange ibr : ranges) {
                header[i] = ibr.toHeaderRangeString(content_length);
                if (// in-part
                i > 0)
                    length += CRLF;
                length += DASHDASH + BOUNDARY + CRLF;
                if (mimetype != null)
                    length += HttpHeader.CONTENT_TYPE.asString().length() + FIELD_SEP + mimetype.length() + CRLF;
                length += HttpHeader.CONTENT_RANGE.asString().length() + FIELD_SEP + header[i].length() + CRLF;
                length += CRLF;
                length += ibr.getSize();
                i++;
            }
            length += CRLF + DASHDASH + BOUNDARY + DASHDASH + CRLF;
            response.setContentLength(length);
            try (RangeWriter rangeWriter = HttpContentRangeWriter.newRangeWriter(content)) {
                i = 0;
                for (InclusiveByteRange ibr : ranges) {
                    multi.startPart(mimetype, new String[] { HttpHeader.CONTENT_RANGE + ": " + header[i] });
                    rangeWriter.writeTo(multi, ibr.getFirst(), ibr.getSize());
                    i++;
                }
            }
            multi.close();
        }
        return true;
    }

    protected void putHeaders(HttpServletResponse response, HttpContent content, long contentLength) {
        if (response instanceof Response) {
            Response r = (Response) response;
            r.putHeaders(content, contentLength, _etags);
            HttpFields fields = r.getHttpFields();
            if (_acceptRanges && !fields.contains(HttpHeader.ACCEPT_RANGES))
                fields.add(ACCEPT_RANGES);
            if (_cacheControl != null && !fields.contains(HttpHeader.CACHE_CONTROL))
                fields.add(_cacheControl);
        } else {
            Response.putHeaders(response, content, contentLength, _etags);
            if (_acceptRanges && !response.containsHeader(HttpHeader.ACCEPT_RANGES.asString()))
                response.setHeader(ACCEPT_RANGES.getName(), ACCEPT_RANGES.getValue());
            if (_cacheControl != null && !response.containsHeader(HttpHeader.CACHE_CONTROL.asString()))
                response.setHeader(_cacheControl.getName(), _cacheControl.getValue());
        }
    }

    // @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
    @Deprecated(since = "2021-05-27")
    public interface WelcomeFactory {

        /**
         * Finds a matching welcome file for the supplied {@link Resource}.
         *
         * @param pathInContext the path of the request
         * @return The path of the matching welcome file in context or null.
         */
        String getWelcomeFile(String pathInContext);
    }
}




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