/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.hc.client5.http.socket;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.Socket;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;

import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.io.Closer;
import org.apache.hc.core5.util.Asserts;
import org.apache.hc.core5.util.TimeValue;

/**
 * The default class for creating plain (unencrypted) sockets.
 *
 * @since 4.3
 */
@Contract(threading = ThreadingBehavior.STATELESS)
public class PlainConnectionSocketFactory implements ConnectionSocketFactory {

    public static final PlainConnectionSocketFactory INSTANCE = new PlainConnectionSocketFactory();

    public static PlainConnectionSocketFactory getSocketFactory() {
        return INSTANCE;
    }

    public PlainConnectionSocketFactory() {
        super();
    }

    @Override
    public Socket createSocket(final Proxy proxy, final HttpContext context) throws IOException {
        return proxy != null ? new Socket(proxy) : createSocket(context);
    }

    @Override
    public Socket createSocket(final HttpContext context) throws IOException {
        return new Socket();
    }

    @Override
    public Socket connectSocket(
            final TimeValue connectTimeout,
            final Socket socket,
            final HttpHost host,
            final InetSocketAddress remoteAddress,
            final InetSocketAddress localAddress,
            final HttpContext context) throws IOException {
        final Socket sock = socket != null ? socket : createSocket(context);
        if (localAddress != null) {
            sock.bind(localAddress);
        }
        try {
            // Run this under a doPrivileged to support lib users that run under a SecurityManager this allows granting connect permissions
            // only to this library
            try {
                AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () -> {
                    sock.connect(remoteAddress, TimeValue.isPositive(connectTimeout) ? connectTimeout.toMillisecondsIntBound() : 0);
                    return null;
                });
            } catch (final PrivilegedActionException e) {
                Asserts.check(e.getCause() instanceof  IOException,
                        "method contract violation only checked exceptions are wrapped: " + e.getCause());
                // only checked exceptions are wrapped - error and RTExceptions are rethrown by doPrivileged
                throw (IOException) e.getCause();
            }
        } catch (final IOException ex) {
            Closer.closeQuietly(sock);
            throw ex;
        }
        return sock;
    }

}
