org.trustedanalytics.cfbroker.config.HadoopZipConfiguration.java Source code

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Here is the source code for org.trustedanalytics.cfbroker.config.HadoopZipConfiguration.java

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/**
 * Copyright (c) 2015 Intel Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.trustedanalytics.cfbroker.config;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.apache.commons.io.IOUtils;
import org.apache.commons.net.util.Base64;
import org.apache.hadoop.conf.Configuration;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

import com.google.common.collect.ImmutableMap;

public final class HadoopZipConfiguration implements HadoopConfiguration {

    private final String encodedZip;

    private final Map<String, String> configParams;

    private HadoopZipConfiguration(String encodedZip) throws IOException {
        this.encodedZip = encodedZip;
        try {
            this.configParams = getAsMap();
        } catch (XPathExpressionException e) {
            throw new ConfigurationException("Zip configuration corrupted", e);
        }
    }

    public static HadoopZipConfiguration createHadoopZipConfiguration(String encodedZip) throws IOException {
        return new HadoopZipConfiguration(encodedZip);
    }

    @Override
    public Configuration getAsHadoopConfiguration() {
        Configuration configuration = new Configuration();
        configParams.entrySet().forEach(pair -> configuration.set(pair.getKey(), pair.getValue()));
        return configuration;
    }

    @Override
    public ImmutableMap getBrokerCredentials() {
        return ImmutableMap.of(ConfigConstants.HADOOP_CONFIG_KEY_VALUE, ImmutableMap.copyOf(configParams),
                ConfigConstants.HADOOP_CONFIG_ZIP_VALUE, ImmutableMap.of(ConfigConstants.DESCRIPTION_KEY,
                        ConfigConstants.DESCRIPTION, ConfigConstants.ZIP, encodedZip));
    }

    @Override
    public Map<String, String> getAsParameterMap() {
        return configParams;
    }

    private Map<String, String> getAsMap() throws IOException, XPathExpressionException {
        InputStream zipInputStream = new ZipInputStream(new ByteArrayInputStream(Base64.decodeBase64(encodedZip)));
        ZipEntry zipFileEntry;
        Map<String, String> map = new HashMap<>();
        while ((zipFileEntry = ((ZipInputStream) zipInputStream).getNextEntry()) != null) {
            if (!zipFileEntry.getName().endsWith("-site.xml")) {
                continue;
            }
            byte[] bytes = IOUtils.toByteArray(zipInputStream);
            InputSource is = new InputSource(new ByteArrayInputStream(bytes));
            XPath xPath = XPathFactory.newInstance().newXPath();
            NodeList nodeList = (NodeList) xPath.evaluate(ConfigConstants.CONF_PROPERTY_XPATH, is,
                    XPathConstants.NODESET);
            for (int i = 0; i < nodeList.getLength(); i++) {
                Node propNode = nodeList.item(i);
                String key = (String) xPath.evaluate("name/text()", propNode, XPathConstants.STRING);
                String value = (String) xPath.evaluate("value/text()", propNode, XPathConstants.STRING);
                map.put(key, value);
            }
        }
        return map;
    }

}