1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/org/sonews/daemon/command/PostCommand.java Sun Aug 29 17:28:58 2010 +0200
1.3 @@ -0,0 +1,332 @@
1.4 +/*
1.5 + * SONEWS News Server
1.6 + * see AUTHORS for the list of contributors
1.7 + *
1.8 + * This program is free software: you can redistribute it and/or modify
1.9 + * it under the terms of the GNU General Public License as published by
1.10 + * the Free Software Foundation, either version 3 of the License, or
1.11 + * (at your option) any later version.
1.12 + *
1.13 + * This program is distributed in the hope that it will be useful,
1.14 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.15 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.16 + * GNU General Public License for more details.
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License
1.19 + * along with this program. If not, see <http://www.gnu.org/licenses/>.
1.20 + */
1.21 +
1.22 +package org.sonews.daemon.command;
1.23 +
1.24 +import java.io.IOException;
1.25 +import java.io.ByteArrayInputStream;
1.26 +import java.io.ByteArrayOutputStream;
1.27 +import java.sql.SQLException;
1.28 +import java.util.Arrays;
1.29 +import javax.mail.MessagingException;
1.30 +import javax.mail.internet.AddressException;
1.31 +import javax.mail.internet.InternetHeaders;
1.32 +import org.sonews.config.Config;
1.33 +import org.sonews.util.Log;
1.34 +import org.sonews.mlgw.Dispatcher;
1.35 +import org.sonews.storage.Article;
1.36 +import org.sonews.storage.Group;
1.37 +import org.sonews.daemon.NNTPConnection;
1.38 +import org.sonews.storage.Headers;
1.39 +import org.sonews.storage.StorageBackendException;
1.40 +import org.sonews.storage.StorageManager;
1.41 +import org.sonews.feed.FeedManager;
1.42 +import org.sonews.util.Stats;
1.43 +
1.44 +/**
1.45 + * Implementation of the POST command. This command requires multiple lines
1.46 + * from the client, so the handling of asynchronous reading is a little tricky
1.47 + * to handle.
1.48 + * @author Christian Lins
1.49 + * @since sonews/0.5.0
1.50 + */
1.51 +public class PostCommand implements Command
1.52 +{
1.53 +
1.54 + private final Article article = new Article();
1.55 + private int lineCount = 0;
1.56 + private long bodySize = 0;
1.57 + private InternetHeaders headers = null;
1.58 + private long maxBodySize =
1.59 + Config.inst().get(Config.ARTICLE_MAXSIZE, 128) * 1024L; // Size in bytes
1.60 + private PostState state = PostState.WaitForLineOne;
1.61 + private final ByteArrayOutputStream bufBody = new ByteArrayOutputStream();
1.62 + private final StringBuilder strHead = new StringBuilder();
1.63 +
1.64 + @Override
1.65 + public String[] getSupportedCommandStrings()
1.66 + {
1.67 + return new String[]{"POST"};
1.68 + }
1.69 +
1.70 + @Override
1.71 + public boolean hasFinished()
1.72 + {
1.73 + return this.state == PostState.Finished;
1.74 + }
1.75 +
1.76 + @Override
1.77 + public String impliedCapability()
1.78 + {
1.79 + return null;
1.80 + }
1.81 +
1.82 + @Override
1.83 + public boolean isStateful()
1.84 + {
1.85 + return true;
1.86 + }
1.87 +
1.88 + /**
1.89 + * Process the given line String. line.trim() was called by NNTPConnection.
1.90 + * @param line
1.91 + * @throws java.io.IOException
1.92 + * @throws java.sql.SQLException
1.93 + */
1.94 + @Override // TODO: Refactor this method to reduce complexity!
1.95 + public void processLine(NNTPConnection conn, String line, byte[] raw)
1.96 + throws IOException, StorageBackendException
1.97 + {
1.98 + switch(state)
1.99 + {
1.100 + case WaitForLineOne:
1.101 + {
1.102 + if(line.equalsIgnoreCase("POST"))
1.103 + {
1.104 + conn.println("340 send article to be posted. End with <CR-LF>.<CR-LF>");
1.105 + state = PostState.ReadingHeaders;
1.106 + }
1.107 + else
1.108 + {
1.109 + conn.println("500 invalid command usage");
1.110 + }
1.111 + break;
1.112 + }
1.113 + case ReadingHeaders:
1.114 + {
1.115 + strHead.append(line);
1.116 + strHead.append(NNTPConnection.NEWLINE);
1.117 +
1.118 + if("".equals(line) || ".".equals(line))
1.119 + {
1.120 + // we finally met the blank line
1.121 + // separating headers from body
1.122 +
1.123 + try
1.124 + {
1.125 + // Parse the header using the InternetHeader class from JavaMail API
1.126 + headers = new InternetHeaders(
1.127 + new ByteArrayInputStream(strHead.toString().trim()
1.128 + .getBytes(conn.getCurrentCharset())));
1.129 +
1.130 + // add the header entries for the article
1.131 + article.setHeaders(headers);
1.132 + }
1.133 + catch (MessagingException e)
1.134 + {
1.135 + e.printStackTrace();
1.136 + conn.println("500 posting failed - invalid header");
1.137 + state = PostState.Finished;
1.138 + break;
1.139 + }
1.140 +
1.141 + // Change charset for reading body;
1.142 + // for multipart messages UTF-8 is returned
1.143 + //conn.setCurrentCharset(article.getBodyCharset());
1.144 +
1.145 + state = PostState.ReadingBody;
1.146 +
1.147 + if(".".equals(line))
1.148 + {
1.149 + // Post an article without body
1.150 + postArticle(conn, article);
1.151 + state = PostState.Finished;
1.152 + }
1.153 + }
1.154 + break;
1.155 + }
1.156 + case ReadingBody:
1.157 + {
1.158 + if(".".equals(line))
1.159 + {
1.160 + // Set some headers needed for Over command
1.161 + headers.setHeader(Headers.LINES, Integer.toString(lineCount));
1.162 + headers.setHeader(Headers.BYTES, Long.toString(bodySize));
1.163 +
1.164 + byte[] body = bufBody.toByteArray();
1.165 + if(body.length >= 2)
1.166 + {
1.167 + // Remove trailing CRLF
1.168 + body = Arrays.copyOf(body, body.length - 2);
1.169 + }
1.170 + article.setBody(body); // set the article body
1.171 +
1.172 + postArticle(conn, article);
1.173 + state = PostState.Finished;
1.174 + }
1.175 + else
1.176 + {
1.177 + bodySize += line.length() + 1;
1.178 + lineCount++;
1.179 +
1.180 + // Add line to body buffer
1.181 + bufBody.write(raw, 0, raw.length);
1.182 + bufBody.write(NNTPConnection.NEWLINE.getBytes());
1.183 +
1.184 + if(bodySize > maxBodySize)
1.185 + {
1.186 + conn.println("500 article is too long");
1.187 + state = PostState.Finished;
1.188 + break;
1.189 + }
1.190 + }
1.191 + break;
1.192 + }
1.193 + default:
1.194 + {
1.195 + // Should never happen
1.196 + Log.get().severe("PostCommand::processLine(): already finished...");
1.197 + }
1.198 + }
1.199 + }
1.200 +
1.201 + /**
1.202 + * Article is a control message and needs special handling.
1.203 + * @param article
1.204 + */
1.205 + private void controlMessage(NNTPConnection conn, Article article)
1.206 + throws IOException
1.207 + {
1.208 + String[] ctrl = article.getHeader(Headers.CONTROL)[0].split(" ");
1.209 + if(ctrl.length == 2) // "cancel <mid>"
1.210 + {
1.211 + try
1.212 + {
1.213 + StorageManager.current().delete(ctrl[1]);
1.214 +
1.215 + // Move cancel message to "control" group
1.216 + article.setHeader(Headers.NEWSGROUPS, "control");
1.217 + StorageManager.current().addArticle(article);
1.218 + conn.println("240 article cancelled");
1.219 + }
1.220 + catch(StorageBackendException ex)
1.221 + {
1.222 + Log.get().severe(ex.toString());
1.223 + conn.println("500 internal server error");
1.224 + }
1.225 + }
1.226 + else
1.227 + {
1.228 + conn.println("441 unknown control header");
1.229 + }
1.230 + }
1.231 +
1.232 + private void supersedeMessage(NNTPConnection conn, Article article)
1.233 + throws IOException
1.234 + {
1.235 + try
1.236 + {
1.237 + String oldMsg = article.getHeader(Headers.SUPERSEDES)[0];
1.238 + StorageManager.current().delete(oldMsg);
1.239 + StorageManager.current().addArticle(article);
1.240 + conn.println("240 article replaced");
1.241 + }
1.242 + catch(StorageBackendException ex)
1.243 + {
1.244 + Log.get().severe(ex.toString());
1.245 + conn.println("500 internal server error");
1.246 + }
1.247 + }
1.248 +
1.249 + private void postArticle(NNTPConnection conn, Article article)
1.250 + throws IOException
1.251 + {
1.252 + if(article.getHeader(Headers.CONTROL)[0].length() > 0)
1.253 + {
1.254 + controlMessage(conn, article);
1.255 + }
1.256 + else if(article.getHeader(Headers.SUPERSEDES)[0].length() > 0)
1.257 + {
1.258 + supersedeMessage(conn, article);
1.259 + }
1.260 + else // Post the article regularily
1.261 + {
1.262 + // Circle check; note that Path can already contain the hostname here
1.263 + String host = Config.inst().get(Config.HOSTNAME, "localhost");
1.264 + if(article.getHeader(Headers.PATH)[0].indexOf(host + "!", 1) > 0)
1.265 + {
1.266 + Log.get().info(article.getMessageID() + " skipped for host " + host);
1.267 + conn.println("441 I know this article already");
1.268 + return;
1.269 + }
1.270 +
1.271 + // Try to create the article in the database or post it to
1.272 + // appropriate mailing list
1.273 + try
1.274 + {
1.275 + boolean success = false;
1.276 + String[] groupnames = article.getHeader(Headers.NEWSGROUPS)[0].split(",");
1.277 + for(String groupname : groupnames)
1.278 + {
1.279 + Group group = StorageManager.current().getGroup(groupname);
1.280 + if(group != null && !group.isDeleted())
1.281 + {
1.282 + if(group.isMailingList() && !conn.isLocalConnection())
1.283 + {
1.284 + // Send to mailing list; the Dispatcher writes
1.285 + // statistics to database
1.286 + Dispatcher.toList(article, group.getName());
1.287 + success = true;
1.288 + }
1.289 + else
1.290 + {
1.291 + // Store in database
1.292 + if(!StorageManager.current().isArticleExisting(article.getMessageID()))
1.293 + {
1.294 + StorageManager.current().addArticle(article);
1.295 +
1.296 + // Log this posting to statistics
1.297 + Stats.getInstance().mailPosted(
1.298 + article.getHeader(Headers.NEWSGROUPS)[0]);
1.299 + }
1.300 + success = true;
1.301 + }
1.302 + }
1.303 + } // end for
1.304 +
1.305 + if(success)
1.306 + {
1.307 + conn.println("240 article posted ok");
1.308 + FeedManager.queueForPush(article);
1.309 + }
1.310 + else
1.311 + {
1.312 + conn.println("441 newsgroup not found");
1.313 + }
1.314 + }
1.315 + catch(AddressException ex)
1.316 + {
1.317 + Log.get().warning(ex.getMessage());
1.318 + conn.println("441 invalid sender address");
1.319 + }
1.320 + catch(MessagingException ex)
1.321 + {
1.322 + // A MessageException is thrown when the sender email address is
1.323 + // invalid or something is wrong with the SMTP server.
1.324 + System.err.println(ex.getLocalizedMessage());
1.325 + conn.println("441 " + ex.getClass().getCanonicalName() + ": " + ex.getLocalizedMessage());
1.326 + }
1.327 + catch(StorageBackendException ex)
1.328 + {
1.329 + ex.printStackTrace();
1.330 + conn.println("500 internal server error");
1.331 + }
1.332 + }
1.333 + }
1.334 +
1.335 +}