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A single bundled dependency that includes all service and dependent JARs with third-party libraries relocated to different namespaces.

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/*
 * Copyright 2011-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * 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://aws.amazon.com/apache2.0
 *
 * This file 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.ibm.cloud.objectstorage.internal;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.Proxy;
import java.net.URI;
import java.util.Map;

import com.ibm.cloud.objectstorage.annotation.SdkInternalApi;

@SdkInternalApi
public class ConnectionUtils {

    private ConnectionUtils() {
    }

    public static ConnectionUtils getInstance() {
        return ConnectionUtilsSingletonHolder.INSTANCE;
    }

    public HttpURLConnection connectToEndpoint(URI endpoint, Map headers) throws IOException {
        return connectToEndpoint(endpoint, headers, "GET");
    }

    public HttpURLConnection connectToEndpoint(URI endpoint, Map headers, String method) throws IOException {
        HttpURLConnection connection = (HttpURLConnection) endpoint.toURL().openConnection(Proxy.NO_PROXY);
        connection.setConnectTimeout(1000 * 2);
        connection.setReadTimeout(1000 * 5);
        connection.setRequestMethod(method);
        connection.setDoOutput(true);

        for (Map.Entry header : headers.entrySet()) {
            connection.addRequestProperty(header.getKey(), header.getValue());
        }

        // TODO should we autoredirect 3xx
        // connection.setInstanceFollowRedirects(false);
        connection.connect();

        return connection;
    }

    private static final class ConnectionUtilsSingletonHolder {
        private static final ConnectionUtils INSTANCE = new ConnectionUtils();
    }
}