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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.IOException;
import java.nio.file.InvalidPathException;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.jetty.http.CompressedContentFormat;
import org.eclipse.jetty.http.HttpContent;
import org.eclipse.jetty.http.HttpContent.ContentFactory;
import org.eclipse.jetty.http.MimeTypes;
import org.eclipse.jetty.http.ResourceHttpContent;
import org.eclipse.jetty.util.resource.Resource;
import org.eclipse.jetty.util.resource.ResourceFactory;

/**
 *  An HttpContent.Factory for transient content (not cached).  The HttpContent's created by
 *  this factory are not intended to be cached, so memory limits for individual
 *  HttpOutput streams are enforced.
 *
 * @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
 */
@Deprecated(since = "2021-05-27")
public class ResourceContentFactory implements ContentFactory {

    private final ResourceFactory _factory;

    private final MimeTypes _mimeTypes;

    private final CompressedContentFormat[] _precompressedFormats;

    public ResourceContentFactory(ResourceFactory factory, MimeTypes mimeTypes, CompressedContentFormat[] precompressedFormats) {
        _factory = factory;
        _mimeTypes = mimeTypes;
        _precompressedFormats = precompressedFormats;
    }

    @Override
    public HttpContent getContent(String pathInContext, int maxBufferSize) throws IOException {
        try {
            // try loading the content from our factory.
            Resource resource = _factory.getResource(pathInContext);
            HttpContent loaded = load(pathInContext, resource, maxBufferSize);
            return loaded;
        } catch (Throwable t) {
            // Any error has potential to reveal fully qualified path
            throw (InvalidPathException) new InvalidPathException(pathInContext, "Invalid PathInContext").initCause(t);
        }
    }

    private HttpContent load(String pathInContext, Resource resource, int maxBufferSize) throws IOException {
        if (resource == null || !resource.exists())
            return null;
        if (resource.isDirectory())
            return new ResourceHttpContent(resource, _mimeTypes.getMimeByExtension(resource.toString()), maxBufferSize);
        // Look for a precompressed resource or content
        String mt = _mimeTypes.getMimeByExtension(pathInContext);
        if (_precompressedFormats.length > 0) {
            // Is there a compressed resource?
            Map compressedContents = new HashMap<>(_precompressedFormats.length);
            for (CompressedContentFormat format : _precompressedFormats) {
                String compressedPathInContext = pathInContext + format.getExtension();
                Resource compressedResource = _factory.getResource(compressedPathInContext);
                if (compressedResource != null && compressedResource.exists() && compressedResource.lastModified() >= resource.lastModified() && compressedResource.length() < resource.length())
                    compressedContents.put(format, new ResourceHttpContent(compressedResource, _mimeTypes.getMimeByExtension(compressedPathInContext), maxBufferSize));
            }
            if (!compressedContents.isEmpty())
                return new ResourceHttpContent(resource, mt, maxBufferSize, compressedContents);
        }
        return new ResourceHttpContent(resource, mt, maxBufferSize);
    }

    @Override
    public String toString() {
        return "ResourceContentFactory[" + _factory + "]@" + hashCode();
    }
}