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    • io.netty.handler.codec.smtp.SmtpRequestEncoder Maven / Gradle / Ivy

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    This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging 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 2016 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:
 *
 *   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 io.netty.handler.codec.smtp;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageEncoder;
import io.netty.util.internal.UnstableApi;

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

/**
 * Encoder for SMTP requests.
 */
@UnstableApi
public final class SmtpRequestEncoder extends MessageToMessageEncoder {
    private static final int CRLF_SHORT = ('\r' << 8) | '\n';
    private static final byte SP = ' ';
    private static final ByteBuf DOT_CRLF_BUFFER = Unpooled.unreleasableBuffer(
            Unpooled.directBuffer(3).writeByte('.').writeByte('\r').writeByte('\n'));

    private boolean contentExpected;

    @Override
    public boolean acceptOutboundMessage(Object msg) throws Exception {
        return msg instanceof SmtpRequest || msg instanceof SmtpContent;
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, Object msg, List out) throws Exception {
        if (msg instanceof SmtpRequest) {
            final SmtpRequest req = (SmtpRequest) msg;
            if (contentExpected) {
                if (req.command().equals(SmtpCommand.RSET)) {
                    contentExpected = false;
                } else {
                    throw new IllegalStateException("SmtpContent expected");
                }
            }
            boolean release = true;
            final ByteBuf buffer = ctx.alloc().buffer();
            try {
                req.command().encode(buffer);
                writeParameters(req.parameters(), buffer);
                ByteBufUtil.writeShortBE(buffer, CRLF_SHORT);
                out.add(buffer);
                release = false;
                if (req.command().isContentExpected()) {
                    contentExpected = true;
                }
            } finally {
                if (release) {
                    buffer.release();
                }
            }
        }

        if (msg instanceof SmtpContent) {
            if (!contentExpected) {
                throw new IllegalStateException("No SmtpContent expected");
            }
            final ByteBuf content = ((SmtpContent) msg).content();
            out.add(content.retain());
            if (msg instanceof LastSmtpContent) {
                out.add(DOT_CRLF_BUFFER.retainedDuplicate());
                contentExpected = false;
            }
        }
    }

    private static void writeParameters(List parameters, ByteBuf out) {
        if (parameters.isEmpty()) {
            return;
        }
        out.writeByte(SP);
        if (parameters instanceof RandomAccess) {
            final int sizeMinusOne = parameters.size() - 1;
            for (int i = 0; i < sizeMinusOne; i++) {
                ByteBufUtil.writeAscii(out, parameters.get(i));
                out.writeByte(SP);
            }
            ByteBufUtil.writeAscii(out, parameters.get(sizeMinusOne));
        } else {
            final Iterator params = parameters.iterator();
            for (;;) {
                ByteBufUtil.writeAscii(out, params.next());
                if (params.hasNext()) {
                    out.writeByte(SP);
                } else {
                    break;
                }
            }
        }
    }
}
    
    
    
    

    




    
    
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