commons-net.jar is the bytecode of Apache Commons Net library, which implements the client side of many basic Internet protocols.

Apache Commons Net Source Code files are provided in the binary packge (commons-net-3.8.0-bin.zip). You can download it at Apache Commons Net Website.

The source code of commons-net-3.8.0.jar is provided below:

⏎ org/apache/commons/net/ftp/FTPSServerSocketFactory.java

/*
 * 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.
 */

package org.apache.commons.net.ftp;

import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;

import javax.net.ServerSocketFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLServerSocket;
import javax.net.ssl.SSLServerSocketFactory;

/**
 * Server socket factory for FTPS connections.
 *
 * @since 2.2
 */
public class FTPSServerSocketFactory extends ServerSocketFactory {

    /** Factory for secure socket factories */
    private final SSLContext sslContext;

    /**
     * Constructs a new instance for the given SSL context.
     *
     * @param sslContext The SSL context.
     */
    public FTPSServerSocketFactory(final SSLContext sslContext) {
        this.sslContext = sslContext;
    }

    @SuppressWarnings("resource") // Factory method.
    @Override
    public ServerSocket createServerSocket() throws IOException {
        return init(getServerSocketFactory().createServerSocket());
    }

    @SuppressWarnings("resource") // Factory method.
    @Override
    public ServerSocket createServerSocket(final int port) throws IOException {
        return init(getServerSocketFactory().createServerSocket(port));
    }

    @SuppressWarnings("resource") // Factory method.
    @Override
    public ServerSocket createServerSocket(final int port, final int backlog) throws IOException {
        return init(getServerSocketFactory().createServerSocket(port, backlog));
    }

    @SuppressWarnings("resource") // Factory method.
    @Override
    public ServerSocket createServerSocket(final int port, final int backlog, final InetAddress ifAddress)
        throws IOException {
        return init(getServerSocketFactory().createServerSocket(port, backlog, ifAddress));
    }

    private SSLServerSocketFactory getServerSocketFactory() {
        return this.sslContext.getServerSocketFactory();
    }

    /**
     * Sets the socket so newly accepted connections will use SSL client mode.
     *
     * @param socket the SSLServerSocket to initialize
     * @return the socket
     * @throws ClassCastException if socket is not an instance of SSLServerSocket
     */
    public ServerSocket init(final ServerSocket socket) {
        ((SSLServerSocket) socket).setUseClientMode(true);
        return socket;
    }
}

⏎ org/apache/commons/net/ftp/FTPSServerSocketFactory.java

Or download all of them as a single archive file:

File name: commons-net-3.8.0-sources.jar
File size: 437325 bytes
Release date: 2020-01-22
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