com.cloudera.nav.sdk.client.writer.MetadataWriterFactory.java Source code

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Here is the source code for com.cloudera.nav.sdk.client.writer.MetadataWriterFactory.java

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/*
 * Copyright (c) 2015 Cloudera, Inc.
 *
 * 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 com.cloudera.nav.sdk.client.writer;

import com.cloudera.nav.sdk.client.ClientConfig;
import com.cloudera.nav.sdk.client.SSLUtils;
import com.google.common.base.Throwables;

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;

import org.apache.commons.net.util.Base64;

/**
 * A factory that returns the appropriate MetadataWriter given a set of
 * configurations
 */
public class MetadataWriterFactory {

    private final ClientConfig config;
    private final boolean isSSL;
    private final SSLContext sslContext;
    private final HostnameVerifier hostnameVerifier;

    public MetadataWriterFactory(ClientConfig config) {
        this.config = config;
        this.isSSL = SSLUtils.isSSL(config.getNavigatorUrl());
        this.sslContext = isSSL ? SSLUtils.getSSLContext(config) : null;
        this.hostnameVerifier = isSSL ? SSLUtils.getHostnameVerifier(config) : null;
    }

    /**
     * Create a new metadata writer
     */
    public MetadataWriter newWriter() {
        try {
            HttpURLConnection conn = createHttpStream();
            OutputStream stream = new BufferedOutputStream(conn.getOutputStream());
            return new JsonMetadataWriter(config, stream, conn);
        } catch (IOException e) {
            throw Throwables.propagate(e);
        }
    }

    private HttpURLConnection createHttpStream() throws IOException {
        String apiUrl = joinUrlPath(
                joinUrlPath(config.getNavigatorUrl(), "api/v" + String.valueOf(config.getApiVersion())),
                "metadata/plugin");
        HttpURLConnection conn = openConnection(new URL(apiUrl));
        conn.setRequestMethod("POST");
        String userpass = config.getUsername() + ":" + config.getPassword();
        String basicAuth = "Basic " + new String(Base64.encodeBase64(userpass.getBytes()));
        conn.addRequestProperty("Authorization", basicAuth);
        conn.addRequestProperty("Content-Type", "application/json");
        conn.setDoOutput(true);
        return conn;
    }

    private HttpURLConnection openConnection(URL url) throws IOException {
        if (isSSL) {
            HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
            conn.setHostnameVerifier(hostnameVerifier);
            conn.setSSLSocketFactory(sslContext.getSocketFactory());
            return conn;
        } else {
            return (HttpURLConnection) url.openConnection();
        }
    }

    private static String joinUrlPath(String base, String component) {
        return base + (base.endsWith("/") ? "" : "/") + component;
    }
}