org.wyb.smtp.mosmtp.SmtpServerHandler.java Source code

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Here is the source code for org.wyb.smtp.mosmtp.SmtpServerHandler.java

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/*
 * Copyright 2012 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 org.wyb.smtp.mosmtp;

import java.net.InetAddress;
import java.text.SimpleDateFormat;
import java.util.Base64;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

/**
 * Handles a server-side channel.
 */
@Sharable
public class SmtpServerHandler extends SimpleChannelInboundHandler<String> {

    private final MessageHandler messageHandler;

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        // Send greeting for a new connection.
        ctx.write("220 " + InetAddress.getLocalHost().getHostName() + " at your service.\r\n");
        ctx.flush();
    }

    public SmtpServerHandler(MessageHandler messageHandler) {
        this.messageHandler = messageHandler;
    }

    private StringBuffer messageBody;
    private boolean isMessageBody = false;
    private boolean isContent = false;
    private Message message;

    @Override
    public void channelRead0(ChannelHandlerContext ctx, String request) throws Exception {
        //System.out.println("request="+request);
        // Generate and write a response.
        String response;
        boolean close = false;
        if (isMessageBody) {
            if (".".equals(request)) {
                message.setSubject(new String(Base64.getDecoder().decode(message.getSubject()), "UTF-8"));
                message.setContent(new String(Base64.getDecoder().decode(messageBody.toString()), "UTF-8"));
                isMessageBody = false;
                isContent = false;
                response = "250 OK";
                this.messageHandler.handle(message);
            } else {
                if (isContent) {
                    if (!request.isEmpty())
                        messageBody.append(request);
                } else {
                    if (request.startsWith("Message-ID: ")) {
                        message.setMessageId(request.substring(13, request.length() - 1));
                    } else if (request.startsWith("Date: ")) {
                        final SimpleDateFormat sdf = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss, Z");
                        message.setTime(sdf.parse(request.substring(6)));
                    } else if (request.startsWith("Subject: ")) {
                        message.setSubject(request.substring(9).split("\\?")[3]);
                    } else if (request.isEmpty()) {
                        isContent = true;
                    }
                }
                return;
            }

        } else if (request.startsWith("HELO ")) {
            response = "250 Hello " + InetAddress.getLocalHost().getHostName() + ", I am glad to meet you";
        } else if (request.startsWith("MAIL FROM:") || request.startsWith("RCPT TO:")) {
            response = "250 Ok";
        } else if ("DATA".equals(request)) {
            messageBody = new StringBuffer();
            message = new Message();
            response = "354 End data with <CR><LF>.<CR><LF>";
            isMessageBody = true;
        } else if ("QUIT".equals(request)) {
            response = "221 Bye";
            close = true;
        } else {
            response = "502 Sorry, I can't do it";
            System.err.println(request);
        }

        // We do not need to write a ChannelBuffer here.
        // We know the encoder inserted at TelnetPipelineFactory will do the
        // conversion.
        //System.out.println(response);
        ChannelFuture future = ctx.write(response + "\r\n");

        // Close the connection after sending 'Have a good day!'
        // if the client has sent 'bye'.
        if (close) {
            future.addListener(ChannelFutureListener.CLOSE);
        }
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        // TODO Auto-generated method stub
        super.channelInactive(ctx);
    }
}