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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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 io.netty.handler.codec.socksx.v5;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.EncoderException;
import io.netty.handler.codec.MessageToByteEncoder;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.StringUtil;

import java.util.List;
import java.util.RandomAccess;

/**
 * Encodes a client-side {@link Socks5Message} into a {@link ByteBuf}.
 */
@Sharable
public class Socks5ClientEncoder extends MessageToByteEncoder {

    public static final Socks5ClientEncoder DEFAULT = new Socks5ClientEncoder();

    private final Socks5AddressEncoder addressEncoder;

    /**
     * Creates a new instance with the default {@link Socks5AddressEncoder}.
     */
    protected Socks5ClientEncoder() {
        this(Socks5AddressEncoder.DEFAULT);
    }

    /**
     * Creates a new instance with the specified {@link Socks5AddressEncoder}.
     */
    public Socks5ClientEncoder(Socks5AddressEncoder addressEncoder) {
        this.addressEncoder = ObjectUtil.checkNotNull(addressEncoder, "addressEncoder");
    }

    /**
     * Returns the {@link Socks5AddressEncoder} of this encoder.
     */
    protected final Socks5AddressEncoder addressEncoder() {
        return addressEncoder;
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, Socks5Message msg, ByteBuf out) throws Exception {
        if (msg instanceof Socks5InitialRequest) {
            encodeAuthMethodRequest((Socks5InitialRequest) msg, out);
        } else if (msg instanceof Socks5PasswordAuthRequest) {
            encodePasswordAuthRequest((Socks5PasswordAuthRequest) msg, out);
        } else if (msg instanceof Socks5CommandRequest) {
            encodeCommandRequest((Socks5CommandRequest) msg, out);
        } else {
            throw new EncoderException("unsupported message type: " + StringUtil.simpleClassName(msg));
        }
    }

    private static void encodeAuthMethodRequest(Socks5InitialRequest msg, ByteBuf out) {
        out.writeByte(msg.version().byteValue());

        final List authMethods = msg.authMethods();
        final int numAuthMethods = authMethods.size();
        out.writeByte(numAuthMethods);

        if (authMethods instanceof RandomAccess) {
            for (int i = 0; i < numAuthMethods; i ++) {
                out.writeByte(authMethods.get(i).byteValue());
            }
        } else {
            for (Socks5AuthMethod a: authMethods) {
                out.writeByte(a.byteValue());
            }
        }
    }

    private static void encodePasswordAuthRequest(Socks5PasswordAuthRequest msg, ByteBuf out) {
        out.writeByte(0x01);

        final String username = msg.username();
        out.writeByte(username.length());
        ByteBufUtil.writeAscii(out, username);

        final String password = msg.password();
        out.writeByte(password.length());
        ByteBufUtil.writeAscii(out, password);
    }

    private void encodeCommandRequest(Socks5CommandRequest msg, ByteBuf out) throws Exception {
        out.writeByte(msg.version().byteValue());
        out.writeByte(msg.type().byteValue());
        out.writeByte(0x00);

        final Socks5AddressType dstAddrType = msg.dstAddrType();
        out.writeByte(dstAddrType.byteValue());
        addressEncoder.encodeAddress(dstAddrType, msg.dstAddr(), out);
        ByteBufUtil.writeShortBE(out, msg.dstPort());
    }
}