netty5/codec-smtp/src/main/java/io/netty/handler/codec/smtp/SmtpRequestEncoder.java

116 lines
4.1 KiB
Java

/*
* 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<Object> {
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<Object> 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);
boolean notEmpty = req.command() != SmtpCommand.EMPTY;
writeParameters(req.parameters(), buffer, notEmpty);
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<CharSequence> parameters, ByteBuf out, boolean commandNotEmpty) {
if (parameters.isEmpty()) {
return;
}
if (commandNotEmpty) {
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<CharSequence> params = parameters.iterator();
for (;;) {
ByteBufUtil.writeAscii(out, params.next());
if (params.hasNext()) {
out.writeByte(SP);
} else {
break;
}
}
}
}
}