de.dentrassi.pm.npm.aspect.NpmExtractor.java Source code

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Here is the source code for de.dentrassi.pm.npm.aspect.NpmExtractor.java

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/*******************************************************************************
 * Copyright (c) 2015 IBH SYSTEMS GmbH.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBH SYSTEMS GmbH - initial API and implementation
 *******************************************************************************/
package de.dentrassi.pm.npm.aspect;

import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.nio.file.Path;
import java.util.Map;
import java.util.zip.GZIPInputStream;

import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;

import com.google.common.io.ByteStreams;
import com.google.gson.JsonParseException;
import com.google.gson.JsonParser;

import de.dentrassi.pm.aspect.extract.Extractor;

public class NpmExtractor implements Extractor {
    @Override
    public void extractMetaData(final Extractor.Context context, final Map<String, String> metadata)
            throws Exception {
        try {
            perform(context.getPath(), metadata);
        } catch (final Exception e) {
        }
    }

    private void perform(final Path file, final Map<String, String> metadata) throws IOException {
        try (final GZIPInputStream gis = new GZIPInputStream(new FileInputStream(file.toFile()));
                final TarArchiveInputStream tis = new TarArchiveInputStream(gis)) {
            TarArchiveEntry entry;
            while ((entry = tis.getNextTarEntry()) != null) {
                if (entry.getName().equals("package/package.json")) {
                    final byte[] data = new byte[(int) entry.getSize()];
                    ByteStreams.read(tis, data, 0, data.length);

                    final String str = StandardCharsets.UTF_8.decode(ByteBuffer.wrap(data)).toString();

                    try {
                        // test parse
                        new JsonParser().parse(str);
                        // store
                        metadata.put("package.json", str);
                    } catch (final JsonParseException e) {
                        // ignore
                    }

                    break; // stop parsing the archive
                }
            }

        }
    }
}