chris@3: /*
chris@3:  *   SONEWS News Server
chris@3:  *   see AUTHORS for the list of contributors
chris@3:  *
chris@3:  *   This program is free software: you can redistribute it and/or modify
chris@3:  *   it under the terms of the GNU General Public License as published by
chris@3:  *   the Free Software Foundation, either version 3 of the License, or
chris@3:  *   (at your option) any later version.
chris@3:  *
chris@3:  *   This program is distributed in the hope that it will be useful,
chris@3:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@3:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@3:  *   GNU General Public License for more details.
chris@3:  *
chris@3:  *   You should have received a copy of the GNU General Public License
chris@3:  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@3:  */
chris@3: package org.sonews.mlgw;
chris@3: 
chris@3: import java.io.BufferedOutputStream;
chris@3: import java.io.BufferedReader;
chris@3: import java.io.IOException;
chris@3: import java.io.InputStreamReader;
chris@3: import java.net.Socket;
chris@3: import java.net.UnknownHostException;
cli@59: import java.util.ArrayList;
cli@59: import java.util.List;
chris@3: import org.sonews.config.Config;
chris@3: import org.sonews.storage.Article;
chris@3: import org.sonews.util.io.ArticleInputStream;
chris@3: 
chris@3: /**
chris@3:  * Connects to a SMTP server and sends a given Article to it.
chris@3:  * @author Christian Lins
cli@28:  * @since sonews/1.0
chris@3:  */
cli@58: class SMTPTransport {
cli@58: 
cli@58: 	public static final String NEWLINE = "\r\n";
chris@3: 
cli@37: 	protected BufferedReader in;
cli@37: 	protected BufferedOutputStream out;
cli@37: 	protected Socket socket;
chris@3: 
cli@37: 	public SMTPTransport(String host, int port)
cli@58: 			throws IOException, UnknownHostException {
cli@58: 		this.socket = new Socket(host, port);
cli@58: 		this.in = new BufferedReader(
cli@58: 				new InputStreamReader(socket.getInputStream()));
cli@37: 		this.out = new BufferedOutputStream(socket.getOutputStream());
chris@3: 
cli@58: 		// Read HELO from server
cli@37: 		String line = this.in.readLine();
cli@37: 		if (line == null || !line.startsWith("220 ")) {
cli@58: 			throw new IOException("Invalid HELO from server: " + line);
cli@37: 		}
cli@37: 	}
chris@3: 
cli@37: 	public void close()
cli@58: 			throws IOException {
cli@37: 		this.out.write("QUIT".getBytes("UTF-8"));
cli@37: 		this.out.flush();
cli@37: 		this.in.readLine();
chris@3: 
cli@37: 		this.socket.close();
cli@37: 	}
chris@3: 
cli@58: 	private void ehlo(String hostname) throws IOException {
cli@58: 		StringBuilder strBuf = new StringBuilder();
cli@58: 		strBuf.append("EHLO ");
cli@58: 		strBuf.append(hostname);
cli@58: 		strBuf.append(NEWLINE);
cli@58: 
cli@58: 		// Send EHLO to server
cli@58: 		this.out.write(strBuf.toString().getBytes("UTF-8"));
cli@58: 		this.out.flush();
cli@58: 
cli@59: 		List<String> ehloReplies = readReply("250");
cli@58: 
cli@58: 		// TODO: Check for supported methods
cli@58: 
cli@58: 		// Do a PLAIN login
cli@58: 		strBuf = new StringBuilder();
cli@58: 		strBuf.append("AUTH PLAIN");
cli@58: 		strBuf.append(NEWLINE);
cli@58: 
cli@58: 		// Send AUTH to server
cli@58: 		this.out.write(strBuf.toString().getBytes("UTF-8"));
cli@58: 		this.out.flush();
cli@58: 
cli@59: 		readReply("334");
cli@59: 
cli@59: 		// Send PLAIN credentials to server
cli@59: 		
cli@59: 
cli@58: 		// Read reply
cli@59: 		String line = this.in.readLine();
cli@58: 		if (line == null || !line.startsWith("250 ")) {
cli@58: 			throw new IOException("Unexpected reply: " + line);
cli@58: 		}
cli@58: 	}
cli@58: 
cli@58: 	private void helo(String hostname) throws IOException {
cli@58: 		StringBuilder heloStr = new StringBuilder();
cli@58: 		heloStr.append("HELO ");
cli@58: 		heloStr.append(hostname);
cli@58: 		heloStr.append(NEWLINE);
cli@58: 
cli@58: 		// Send HELO to server
cli@58: 		this.out.write(heloStr.toString().getBytes("UTF-8"));
cli@58: 		this.out.flush();
cli@58: 
cli@58: 		// Read reply
cli@59: 		readReply("250");
cli@58: 	}
cli@58: 
cli@58: 	public void login() throws IOException {
cli@58: 		String hostname = Config.inst().get(Config.HOSTNAME, "localhost");
cli@58: 		String auth = Config.inst().get(Config.MLSEND_AUTH, "none");
cli@58: 		if(auth.equals("none")) {
cli@58: 			helo(hostname);
cli@58: 		} else {
cli@58: 			ehlo(hostname);
cli@58: 		}
cli@58: 	}
cli@58: 
cli@59: 	/**
cli@59: 	 * Read one or more exspected reply lines.
cli@59: 	 * @param expectedReply
cli@59: 	 * @return
cli@59: 	 * @throws IOException If the reply of the server does not fit the exspected
cli@59: 	 * reply code.
cli@59: 	 */
cli@59: 	private List<String> readReply(String expectedReply) throws IOException {
cli@59: 		List<String> replyStrings = new ArrayList<String>();
cli@59: 
cli@59: 		for(;;) {
cli@59: 			String line = this.in.readLine();
cli@59: 			if (line == null || !line.startsWith(expectedReply)) {
cli@59: 				throw new IOException("Unexpected reply: " + line);
cli@59: 			}
cli@59: 
cli@59: 			replyStrings.add(line);
cli@59: 
cli@59: 			if(line.charAt(3) == ' ') { // Last reply line
cli@59: 				break;
cli@59: 			}
cli@59: 		}
cli@59: 
cli@59: 		return replyStrings;
cli@59: 	}
cli@59: 
cli@37: 	public void send(Article article, String mailFrom, String rcptTo)
cli@58: 			throws IOException {
cli@37: 		assert (article != null);
cli@37: 		assert (mailFrom != null);
cli@37: 		assert (rcptTo != null);
cli@12: 
cli@37: 		this.out.write(("MAIL FROM: " + mailFrom).getBytes("UTF-8"));
cli@37: 		this.out.flush();
cli@37: 		String line = this.in.readLine();
cli@37: 		if (line == null || !line.startsWith("250 ")) {
cli@37: 			throw new IOException("Unexpected reply: " + line);
cli@37: 		}
chris@3: 
cli@37: 		this.out.write(("RCPT TO: " + rcptTo).getBytes("UTF-8"));
cli@37: 		this.out.flush();
cli@37: 		line = this.in.readLine();
cli@37: 		if (line == null || !line.startsWith("250 ")) {
cli@37: 			throw new IOException("Unexpected reply: " + line);
cli@37: 		}
chris@3: 
cli@37: 		this.out.write("DATA".getBytes("UTF-8"));
cli@37: 		this.out.flush();
cli@37: 		line = this.in.readLine();
cli@37: 		if (line == null || !line.startsWith("354 ")) {
cli@37: 			throw new IOException("Unexpected reply: " + line);
cli@37: 		}
chris@3: 
cli@37: 		ArticleInputStream artStream = new ArticleInputStream(article);
cli@37: 		for (int b = artStream.read(); b >= 0; b = artStream.read()) {
cli@37: 			this.out.write(b);
cli@37: 		}
chris@3: 
cli@37: 		// Flush the binary stream; important because otherwise the output
cli@37: 		// will be mixed with the PrintWriter.
cli@37: 		this.out.flush();
cli@37: 		this.out.write("\r\n.\r\n".getBytes("UTF-8"));
cli@37: 		this.out.flush();
cli@37: 		line = this.in.readLine();
cli@37: 		if (line == null || !line.startsWith("250 ")) {
cli@37: 			throw new IOException("Unexpected reply: " + line);
cli@37: 		}
cli@37: 	}
chris@3: }