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