src/org/ibex/mail/NNTP.java

   1 // Copyright 2000-2005 the Contributors, as shown in the revision logs.
   2 // Licensed under the Apache Public Source License 2.0 ("the License").
   3 // You may not use this file except in compliance with the License.
   4
   5 // 500 unrec. command
   6 // 501 syntax error
   7 // 503 optional subfeature not supported
   8 // Xref header
   9 // LIST EXTENSIONS is probably incomplete
  10 // pull mode (ie suck)
  11 // control message processing?
  12
  13 package org.ibex.mail;
  14 import org.ibex.util.*;
  15 import org.ibex.io.*;
  16 import org.ibex.net.*;
  17 import org.ibex.mail.target.*;
  18 import org.ibex.jinetd.*;
  19 import java.io.*;
  20 import java.net.*;
  21 import java.util.*;
  22 import java.text.*;
  23
  24 /** NNTP send/recieve */
  25 public class NNTP {
  26
  27     public static final DateFormat dateFormat = new SimpleDateFormat("yyyyMMDDhhmmss");
  28
  29     public static class No  extends RuntimeException { int code = 400; }                                       // 4xx response codes
  30     public static class Bad extends RuntimeException { int code = 500; public Bad(String s) { super(s); } }    // 5xx response codes
  31
  32     public static class Group {
  33         public Group(String n, boolean p, int f, int l, int c) { this.name=n;this.post=p;this.first=f;this.last=l;this.count=c;}
  34         public final String  name;    // case insensitive
  35         public final boolean post;
  36         public final int     first;
  37         public final int     last;
  38         public final int     count;   // an approximation; must be >= actual number
  39     }
  40
  41     public static class Article {
  42         public Article(int num, Message message) { this.message = message; this.num = num; }
  43         public final int     num;
  44         public final Message message;
  45     }
  46
  47     public static interface Server {
  48         public Group    group(String s);
  49         public boolean  ihave(String messageid);
  50         public Article  next();
  51         public Article  last();
  52         public boolean  postok();
  53         public void     post(Message m) throws IOException;
  54         public Article  article(String messageid,  boolean head, boolean body);
  55         public Article  article(int    messagenum, boolean head, boolean body);
  56         public Group[]  list();
  57         public Group[]  newgroups(Date d, String[] distributions);
  58         public String[] newnews(String[] groups, Date d, String[] distributions);
  59     }
  60
  61     public static class MailboxWrapper implements Server {
  62         private final MailTree root;
  63         private Mailbox current;
  64         private int ptr = 0;
  65         private boolean post;
  66         public MailboxWrapper(MailTree root) { this(root, false); }
  67         public MailboxWrapper(MailTree root, boolean post) { this.root = root; this.post = post; }
  68         public boolean  postok() { return post; }
  69         public void     post(Message m) throws IOException { current.post(m); }
  70         public Group    group(String s) {
  71             ptr = 0;
  72             Group g = getgroup(s);
  73             if (g==null) return null;
  74             setgroup(s);
  75             return g;
  76         }
  77
  78         public boolean  ihave(String messageid) { /* FEATURE */ return false; }
  79
  80         public Article  next()                  { return article(ptr++, false, false); }
  81         public Article  last()                  { return article(ptr--, false, false); }
  82         public Article  article(String i, boolean h, boolean b) { return article(Query.header("message-id",i),h,b); }
  83         public Article  article(int    n, boolean h, boolean b) { ptr = n; return article(Query.nntpNumber(n,n),h,b); }
  84         private Article article(Query q,  boolean head, boolean body) {
  85             Mailbox.Iterator it = current.iterator(q);
  86             if (!it.next()) return null;
  87             try {
  88                 // FIXME: UGLY!
  89                 Message m = body ? it.cur() : Message.newMessage(new Fountain.StringFountain(it.head() + "\r\n"));
  90                 return new Article(it.nntpNumber(), m);
  91             } catch (Exception e) { return null; }
  92         }
  93         public Group[]  list() { return list(root, ""); }
  94         private Group[] list(MailTree who, String prefix) {
  95             Vec v = new Vec();
  96             if (who == null) who = root;
  97             String[] s = who.children();
  98             for(int i=0; i<s.length; i++) {
  99                 v.addElement(new Group(prefix + s[i], true, 0, 0, 0)); // FIXME numbers
 100                 Group[] g2 = list(who.slash(s[i], false), prefix + s[i] + ".");
 101                 for(int j=0; j<g2.length; j++) v.addElement(g2[j]);
 102             }
 103             Group[] ret = new Group[v.size()];
 104             v.copyInto(ret);
 105             return ret;
 106         }
 107
 108         private void setgroup(String s) {
 109             MailTree ncurrent = root;
 110             for(StringTokenizer st = new StringTokenizer(s, ".");
 111                 ncurrent != null && st.hasMoreTokens();
 112                 ncurrent = ncurrent.slash(st.nextToken(), false));
 113             if (ncurrent!=null) current=ncurrent.getMailbox();
 114         }
 115         private Group getgroup(String s) {
 116             MailTree box = root;
 117             for(StringTokenizer st = new StringTokenizer(s, ".");
 118                 box!=null && st.hasMoreTokens();
 119                 box = box.slash(st.nextToken(), false));
 120             if (box==null) return null;
 121             return new Group(s, true, 1, box.getMailbox().count(Query.all()), box.getMailbox().count(Query.all()));
 122         }
 123
 124         public Group[]  newgroups(Date d, String[] distributions) { /* FEATURE */ return new Group[] { }; }
 125         public String[] newnews(String[] groups, Date d, String[] distributions) { /* FIXME */  return null; }
 126     }
 127
 128     public static class Listener {
 129         private Server api = null;
 130         private Login login;
 131         private Connection conn;
 132         public Listener(Login l) { this.login = l; }
 133
 134         private void println(String s) { Log.warn("[nntp-write]", s); conn.println(s); }
 135         private void println() { Log.warn("[nntp-write]", ""); conn.println(""); }
 136         private void print(String s) { Log.warn("[nntp-write]", s); conn.print(s); }
 137
 138         private void article(String numOrMessageId, boolean head, boolean body) {
 139             String s = numOrMessageId.trim();
 140             Article a;
 141             if (s.startsWith("<")) a = api.article(s.substring(0, s.length() - 1), head, body);
 142             else                   a = api.article(Integer.parseInt(s), head, body);
 143             if (a == null) {
 144                 println("423 No such article.");
 145                 return;
 146             }
 147             int code = (head && body) ? 220 : head ? 221 : body ? 222 : 223;
 148             println(code + " " + a.num + " <" + a.message.messageid + "> get ready for some stuff...");
 149             if (head) { a.message.headers.getStream().transcribe(conn); println(); }
 150             if (head && body) println();
 151             if (body) {
 152                 Stream stream = a.message.getBody().getStream();
 153                 while(true) {
 154                     s = stream.readln();
 155                     if (s == null) break;
 156                     if (s.startsWith(".")) print(".");
 157                     println(s);
 158                 }
 159             }
 160             println(".");
 161         }
 162         public void handleRequest(Connection conn) {
 163             this.conn = conn;
 164             conn.setTimeout(30 * 60 * 1000);
 165             conn.setNewline("\r\n");
 166             println("200 " + conn.vhost + " [" + NNTP.class.getName() + "]");
 167             String user = null;
 168             String pass = null;
 169             Account account = login.anonymous();
 170             this.api = account == null ? null : new MailboxWrapper(account.getMailbox(NNTP.class), true);
 171             for(String line = conn.readln(); line != null; line = conn.readln()) try {
 172                 Log.warn("[nntp-read]", line);
 173                 StringTokenizer st = new StringTokenizer(line, " ");
 174                 String command = st.nextToken().toUpperCase();
 175                 if (command.equals("AUTHINFO")) {
 176                     // FIXME technically the RFC says we need to use this info to generate a SEnder: header...
 177                     String uop = st.nextToken().toUpperCase();
 178                     if (uop.equals("USER")) {
 179                         user = st.nextToken();
 180                         println("381 More authentication required");
 181                         continue;
 182                     } else if (uop.equals("PASS")) {
 183                         pass = st.nextToken();
 184                         account = login.login(user, pass);
 185                         if (account == null) { println("502 Invalid"); continue; }
 186                         this.api = new MailboxWrapper(account.getMailbox(NNTP.class), true);
 187                         println("281 Good to go");
 188                         continue;
 189                     }
 190                     throw new Bad("wtf are you talking about?");
 191                 }
 192                 if (this.api == null) {
 193                     if (user == null) { println("480 Authentication required"); continue; }
 194                     if (pass == null) { println("381 Password required"); continue; }
 195                 }
 196                 if        (command.equals("ARTICLE"))   { article(st.hasMoreTokens() ? st.nextToken() : null, true,  true);
 197                 } else if (command.equals("HEAD"))      { article(st.hasMoreTokens() ? st.nextToken() : null, true,  false);
 198                 } else if (command.equals("DATE"))      {
 199                     // FIXME must be GMT
 200                     println("111 " + dateFormat.format(new Date()));
 201                 } else if (command.equals("MODE"))      {
 202                     if (st.hasMoreTokens()) {
 203                         String arg = st.nextToken();
 204                         if (arg.equalsIgnoreCase("STREAM"));
 205                         //streaming = true;
 206                         println("203 Streaming permitted");
 207                     } else {
 208                         println("201 Hello, you can post.");
 209                     }
 210                 } else if (command.equals("BODY"))      { article(st.hasMoreTokens() ? st.nextToken() : null, false, true);
 211                 } else if (command.equals("STAT"))      { article(st.hasMoreTokens() ? st.nextToken() : null, false, false);
 212                 } else if (command.equals("HELP"))      { println("100 you are beyond help."); println(".");
 213                 } else if (command.equals("SLAVE"))     { println("220 SLAVE was removed in RFC3977, you should not use it");
 214                 } else if (command.equals("XOVER"))     {
 215                     println("224 Overview information follows");
 216                     MailboxWrapper api = (MailboxWrapper)this.api;
 217                     String range = st.hasMoreTokens() ? st.nextToken() : (api.ptr+"-"+api.ptr);
 218                     int start = Integer.parseInt(range.substring(0, range.indexOf('-')));
 219                     int end   = Integer.parseInt(range.substring(range.indexOf('-') + 1));
 220                     Mailbox.Iterator it = api.current.iterator(Query.nntpNumber(start, end));
 221                     while(it.next()) {
 222                         try {
 223                             Message m = it.cur();
 224                             println(it.nntpNumber()+"\t"+m.subject+"\t"+m.from+"\t"+m.date+"\t"+m.messageid+"\t"+
 225                                     m.headers.get("references") + "\t" + m.getLength() + "\t" + m.getNumLines());
 226                         } catch (Exception e) { Log.error(this, e); }
 227                     }
 228                     println(".");
 229                 } else if (command.equals("LAST"))      {
 230                     Article a = api.last(); println("223 "+a.num+" "+a.message.messageid+" ok");
 231                 } else if (command.equals("NEXT"))      {
 232                     Article a = api.next(); println("223 "+a.num+" "+a.message.messageid+" ok");
 233                 } else if (command.equals("QUIT"))      { println("205 Bye."); conn.close(); return;
 234                 } else if (command.equals("GROUP"))     {
 235                     Group g = api.group(st.nextToken().toLowerCase());
 236                     if (g==null) println("411 no such group");
 237                     else         println("211 " + g.count + " " + g.first + " " + g.last + " " + g.name);
 238                 } else if (command.equals("NEWGROUPS") || command.equals("NEWNEWS")) {
 239                     // FIXME: * and ! unsupported
 240                     // NEWNEWS is often not supported
 241                     String groups = command.equals("NEWNEWS") ? st.nextToken() : null;
 242                     String datetime = st.nextToken() + " " + st.nextToken();
 243                     String gmt = st.nextToken();
 244                     String distributions = gmt.equals("GMT") ? (st.hasMoreTokens() ? st.nextToken() : "") : gmt;
 245                     while(st.hasMoreTokens()) distributions += " " + st.nextToken();
 246
 247                     // FIXME deal with GMT
 248                     Date d = new Date();
 249                     try {
 250                         d = new SimpleDateFormat("yyMMDD HHMMSS").parse(datetime);
 251                     } catch (ParseException pe) {
 252                         Log.warn(this, pe);
 253                     }
 254                     distributions = distributions.trim();
 255                     if (distributions.startsWith("<")) distributions = distributions.substring(1, distributions.length() - 1);
 256
 257                     st = new StringTokenizer(distributions, ",");
 258                     String[] dists = new String[st.countTokens()];
 259                     for(int i=0; st.hasMoreTokens(); i++) dists[i] = st.nextToken();
 260
 261                     if (command.equals("NEWGROUPS")) {
 262                         Group[] g = api.newgroups(d, dists);
 263                         println("231 list of groups follows");
 264                         for(int i=0; i<g.length; i++)
 265                             println(g[i].name + " " + g[i].last + " " + g[i].first + " " + (g[i].post ? "y" : "n"));
 266                         println(".");
 267                     } else {
 268                         st = new StringTokenizer(groups, ",");
 269                         String[] g = new String[st.countTokens()];
 270                         for(int i=0; st.hasMoreTokens(); i++) g[i] = st.nextToken();
 271                         String[] a = api.newnews(g, d, dists);
 272                         println("230 list of article messageids follows");
 273                         for(int i=0; i<a.length; i++) println(a[i]);
 274                         println(".");
 275                     }
 276
 277                 } else if (command.equals("POST"))      {
 278                     // FIXME
 279                     // add NNTP-Posting-Host header
 280                     // Path header: prepend <myname>, (any punctuation separates the list)
 281                     // Expires header: the date when expiration happens (??) should we ignore this?
 282                     // Control header: body is the command.  Inteprert posts to all.all.ctl as control messages,
 283                     //                 use Subject line if no Cntrol line
 284                     // "Approved" line is used for moderaion
 285                     // Xref: drop this header if you see it
 286
 287                     // Control messages
 288                     //   cancel <Message-ID>      (do not forward if I am unable to cancel locally)
 289                     //   ihave/sendme:            do not support
 290                     //   newgroup <groupname> [moderated] -- body of message is a description of the group
 291                     //   rmgroup  <groupname>
 292
 293                     boolean postok = api.postok();
 294                     if (!postok) {
 295                         println("440 no posting allowed");
 296                     } else {
 297                       println("340 send the article");
 298                       StringBuffer buf = new StringBuffer();
 299                       // FIXME: streaming?
 300                       while(true) {
 301                         String s = conn.readln();
 302                         if (s == null) throw new RuntimeException("connection closed");
 303                         if (s.equals(".")) break;
 304                         if (s.startsWith(".")) s = s.substring(1);
 305                         buf.append(s + "\r\n");
 306                       }
 307                       String body = buf.toString();
 308                       try {
 309                           Message m = Message.newMessage(new Fountain.StringFountain(body));
 310                           if (m.headers.get("newsgroups")==null)
 311                               println("441 posted messages must have a Newsgroups header per RFC 977");
 312                           else if (m.headers.get("newsgroups").indexOf('*')!=-1)
 313                               println("441 Newsgroups header in posted messages may not contain wildcards (*) per RFC 977");
 314                           else if (m.headers.get("subject")==null)
 315                               println("441 posted messages must have a Subject header per RFC 977");
 316                           //                          else if (m.headers.get("path")==null)
 317                           //println("441 posted messages must have a Path header per RFC 977");
 318                           else if (m.headers.get("from")==null)
 319                               println("441 posted messages must have a From header per RFC 977");
 320                           else if (m.headers.get("date")==null)
 321                               println("441 posted messages must have a Date header per RFC 977");
 322                           else {
 323                               api.post(m);
 324                               println("240 article posted ok");
 325                           }
 326                       } catch (Exception e) {
 327                           e.printStackTrace();
 328                           println("441 posting failed: " + e);
 329                       }
 330                     }
 331
 332                 } else if (command.equals("XROVER"))      {
 333                     // equivalent to "XHDR References"
 334                 } else if (command.equals("XHDR"))      {
 335                     // argument: header name
 336                     // argument: 1 | 1- | 1-2 | <mid> | nothing (use current article)
 337                     println("221 yep");
 338                     // print art#+header for all matching messages
 339                     println(".");
 340                     // 412 if no group selected and numeric form used
 341                     // 430 if <mid> and not found
 342                     // 420 if no messages in range
 343                 } else if (command.equals("XPAT"))      {
 344                     // just like XHDR, but a pattern follows the last argument (may contain whitespace)
 345                     println("221 yep");
 346                     // print
 347                     println(".");
 348                 } else if (command.equals("LIST"))      {
 349                     if (st.hasMoreTokens()) {
 350                         String argument = st.nextToken().toUpperCase();
 351                         if (argument.equalsIgnoreCase("EXTENSIONS")) {
 352                             println("202 Extensions supported:");
 353                             println("STREAMING");
 354                             println("");
 355                             println(".");
 356                         } else if (argument.equals("ACTIVE")) {
 357                             String wildmat = st.hasMoreTokens() ? st.nextToken() : null;
 358                             // FIXME: deal with wildmat
 359                             // just like list, but only show active groups
 360                             throw new Bad("not implemented yet");
 361                         } else if (argument.equals("SUBSCRIPTIONS")) {
 362                             // FIXME: show 215, default subscription list for new users, period
 363                         } else if (argument.equals("OVERVIEW.FMT")) {
 364                             println("215 Overview format:");
 365                             println("Subject:");
 366                             println("From:");
 367                             println("Date:");
 368                             println("Message-ID:");
 369                             println("References:");
 370                             println("Bytes:");
 371                             println("Lines:");
 372                             //println("Xref:full");
 373                             println(".");
 374                         } else if (argument.equals("NEWSGROUPS")) {
 375                             String wildmat = st.hasMoreTokens() ? st.nextToken() : null;
 376                             // respond 215, print each newsgroup, a space, and the description; end with lone period
 377                         } else {
 378                             // barf here
 379                         }
 380                     } else {
 381                         Group[] g = api.list();
 382                         println("215 list of groups follows");
 383                         for(int i=0; i<g.length; i++)
 384                             println(g[i].name + " " + g[i].last + " " + g[i].first + " " + (g[i].post ? "y" : "n"));
 385                         println(".");
 386                     }
 387
 388                 } else if (command.equals("LISTGROUP"))     {
 389                     String groupname = st.hasMoreTokens() ? st.nextToken() : null;
 390                     // 211, all article numbers in group, period.  Set article ptr to first item in group
 391
 392                 } else if (command.equals("XGTITLE"))     {
 393                     String wildmat = st.hasMoreTokens() ? st.nextToken() : null;
 394                     // 282, then identical to LIST NEWSGROUP
 395
 396                 } else if (command.equals("CHECK"))     {
 397                     // FIXME: may be pipelined; must spawn threads
 398                     String mid = st.nextToken();
 399                     boolean want = api.ihave(mid);
 400                     if (!want) {
 401                         println("438 "+ mid+" No thanks");
 402                     } else {
 403                         println("238 "+mid+" Yes, I'd like that");
 404                     }
 405
 406                 } else if (command.equals("TAKETHIS"))     {
 407                     // FIXME: may be pipelined
 408                     String mid = st.nextToken();
 409                     // MUST read message here
 410                     /*
 411                     if (!want) {
 412                         println("439 "+ mid+" Transfer failed");
 413                     } else {
 414                         println("239 "+mid+" Rock on.");
 415                     }
 416                     */
 417
 418                 } else if (command.equals("IHAVE"))     {
 419                     boolean want = api.ihave(st.nextToken());
 420                     if (!want) {
 421                         println("435 No thanks");
 422                     } else {
 423                         println("335 Proceed");
 424                         // FIXME read article here
 425                         println("235 Got it");
 426                     }
 427                 } else {
 428                     throw new Bad("wtf are you talking about?");
 429                 }
 430             } catch (No n)  { println(n.code + " " + n.getMessage());
 431             } catch (Bad b) { println(b.code + " " + b.getMessage()); Log.warn(this, b); }
 432             conn.close();
 433         }
 434     }
 435 }