src/org/ibex/mail/FileBasedMailbox.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 package org.ibex.mail;
   6 import org.prevayler.*;
   7 import org.ibex.mail.*;
   8 import org.ibex.util.*;
   9 import org.ibex.io.*;
  10 import java.io.*;
  11 import java.nio.*;
  12 import java.nio.channels.*;
  13 import java.net.*;
  14 import java.util.*;
  15 import java.text.*;
  16 import javax.servlet.*;
  17 import javax.servlet.http.*;
  18
  19 /** An exceptionally crude implementation of Mailbox relying on POSIXy filesystem semantics */
  20 public class FileBasedMailbox extends Mailbox.Default {
  21
  22     public static final long MAGIC_DATE = 0;
  23     private static final char slash = File.separatorChar;
  24     private static final WeakHashMap<String,Mailbox> instances = new WeakHashMap<String,Mailbox>();
  25     public String toString() { return "[FileBasedMailbox " + path.getAbsolutePath() + "]"; }
  26     public Mailbox slash(String name, boolean create) { return getFileBasedMailbox(path.getAbsolutePath()+slash+name, create); }
  27
  28     // FIXME: should be a File()
  29     public static synchronized Mailbox getFileBasedMailbox(String path, boolean create) {
  30         try {
  31             Mailbox ret = instances.get(path);
  32             if (ret == null) {
  33                 if (!create && !(new File(path).exists())) return null;
  34                 if (new File(new File(path)+"/subscribers").exists()) {
  35                     ret = new MailingList(new File(path), new FileBasedMailbox(new File(path)));
  36                 } else {
  37                     ret = new FileBasedMailbox(new File(path));
  38                 }
  39                 instances.put(path, ret);
  40             }
  41             return ret;
  42         } catch (Exception e) {
  43             Log.error(FileBasedMailbox.class, e);
  44             return null;
  45         }
  46     }
  47
  48     // Instance //////////////////////////////////////////////////////////////////////////////
  49
  50     private File path;
  51     private FileLock lock;
  52     private int uidNext;
  53     private int uidValidity;
  54
  55     // Helpers //////////////////////////////////////////////////////////////////////////////
  56
  57     private static void rmDashRf(File f) throws IOException {
  58         if (!f.isDirectory()) { f.delete(); return; }
  59         String[] children = f.list();
  60         for(int i=0; i<children.length; i++) rmDashRf(new File(f.getAbsolutePath() + slash + children[i]));
  61         f.delete();
  62     }
  63
  64     private FileBasedMailbox(File path) throws MailException, IOException, ClassNotFoundException {
  65         this.path = path;
  66         path.mkdirs();
  67
  68         // acquire lock
  69         File lockfile = new File(this.path.getAbsolutePath() + slash + ".lock");
  70         lock = new RandomAccessFile(lockfile, "rw").getChannel().tryLock();
  71         /*
  72         if (lock == null) {
  73             Log.warn(this, "warning: blocking waiting for a lock on " + path);
  74             lock = new RandomAccessFile(lockfile, "rw").getChannel().lock();
  75             if (lock == null) throw new IOException("unable to lock FileBasedMailbox: " + path);
  76         }
  77         lockfile.deleteOnExit();
  78         */
  79
  80         uidValidity = (int)(lockfile.lastModified() & 0xffffffff);
  81         uidNext = 0;
  82         String[] files = path.list();
  83         for(int i=0; i<files.length; i++) {
  84             try {
  85                 if (files[i].indexOf('.') <= 0) continue;
  86                 files[i] = files[i].substring(0, files[i].indexOf('.'));
  87                 int n = Integer.parseInt(files[i]);
  88                 if (n>=uidNext) uidNext = n;
  89             } catch(Exception e) { Log.error(this, e); }
  90         }
  91     }
  92
  93     public String[] sort(String[] s) {
  94         Arrays.sort(s);
  95         return s;
  96     }
  97
  98     public String[] files() {
  99         String[] s = path.list(filter);
 100         Arrays.sort(s, comparator);
 101         return s;
 102     }
 103
 104     private static Comparator<String> comparator = new Comparator<String>() {
 105         public int compare(String a, String b) {
 106             if (a.indexOf('.')==-1) return a.compareTo(b);
 107             if (b.indexOf('.')==-1) return a.compareTo(a);
 108             int ai = Integer.parseInt(a.substring(0, a.indexOf('.')));
 109             int bi = Integer.parseInt(b.substring(0, b.indexOf('.')));
 110             return ai<bi ? -1 : ai>bi ? 1 : 0;
 111         }
 112     };
 113
 114     public Mailbox.Iterator  iterator()           { return new Iterator(); }
 115     public String[] children() {
 116         Vec vec = new Vec();
 117         String[] list = sort(path.list());
 118         for(int i=0; i<list.length; i++) {
 119             File f = new File(path.getAbsolutePath() + slash + list[i]);
 120             if (f.isDirectory() && f.getName().charAt(0) != '.') vec.addElement(list[i]);
 121         }
 122         return (String[])vec.copyInto(new String[vec.size()]);
 123     }
 124
 125     public int uidValidity() { return uidValidity; }
 126     public int uidNext() {  return uidNext; }
 127     public synchronized void insert(Message message, int flags) {
 128         try {
 129             String name, fullname; File target, f;
 130             for(int i = uidNext; ; i++) {
 131                 name = i + ".";
 132                 fullname = path.getAbsolutePath() + slash + name;
 133                 target = new File(fullname);
 134                 f = new File(target.getCanonicalPath() + "-");
 135                 if (!f.exists() && !target.exists()) break;
 136                 Log.error(this, "aieeee!!!! target of insert() already exists: " + target.getAbsolutePath());
 137             }
 138             Stream stream = new Stream(new FileOutputStream(f));
 139             message.getStream().transcribe(stream);
 140             stream.close();
 141             f.renameTo(new File(fullname));
 142             uidNext++;
 143             f = new File(fullname);
 144             if ((flags & Mailbox.Flag.SEEN) == Mailbox.Flag.SEEN) f.setLastModified(MAGIC_DATE);
 145         } catch (IOException e) { throw new MailException.IOException(e); }
 146         Log.info(this, path + " <= " + message.summary());
 147     }
 148
 149     private static FilenameFilter filter =
 150         new FilenameFilter() { public boolean accept(File dir, String name) {
 151             return name.endsWith(".");
 152         } };
 153
 154     private class Iterator extends Mailbox.Default.Iterator {
 155         int cur = -1;
 156         String[] files = files();
 157         private File file() { return new File(path.getAbsolutePath() + slash + files[cur]); }
 158         public boolean done() { return cur >= files.length; }
 159         public boolean next() { cur++; return !done(); }
 160         public boolean seen() { return false; }
 161         public boolean recent() { return false; }
 162         public int nntpNumber() { return cur+1; }  // FIXME: lame
 163         public int imapNumber() { return cur+1; }  // EUDORA insists that message numbers start at 1, not 0
 164         public int uid() { return done() ? -1 : Integer.parseInt(files[cur].substring(0, files[cur].length()-1)); }
 165         public void delete() { File f = file(); if (f != null && f.exists()) f.delete(); }
 166         public void seen(boolean seen) { }
 167         public Headers head() {
 168             if (done()) return null;
 169             FileInputStream fis = null;
 170             try {
 171                 return new Headers.Original(new Stream(new FileInputStream(file())));
 172             } catch (IOException e) { throw new MailException.IOException(e);
 173             } finally { if (fis != null) try { fis.close(); } catch (Exception e) { /* DELIBERATE */ } }
 174         }
 175         public Message cur() {
 176             FileInputStream fis = null;
 177             try {
 178                 return Message.newMessage(new Fountain.File(file()));
 179                 //} catch (IOException e) { throw new MailException.IOException(e);
 180             } catch (Message.Malformed e) { throw new MailException(e.getMessage());
 181             } finally { if (fis != null) try { fis.close(); } catch (Exception e) { /* DELIBERATE */ } }
 182         }
 183     }
 184
 185     public static class Servlet extends HttpServlet {
 186         public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException { doGet(request, response); }
 187         private void frames(HttpServletRequest request, HttpServletResponse response, boolean top) throws IOException {
 188             String basename = request.getRequestURI();
 189             PrintWriter pw = new PrintWriter(response.getWriter());
 190             pw.println("<html>");
 191             if (top) {
 192                 pw.println("  <frameset rows='30%,*'>");
 193                 //pw.println("    <frame src='"+basename+"?frame=banner' marginwidth=0 marginheight=0 name=banner/>");
 194                 //pw.println("    <frame src='"+basename+"?frame=top' marginwidth=0 marginheight=0 name=top/>");
 195                 pw.println("    <frame src='"+basename+"?frame=topright' marginwidth=0 marginheight=0 name=topright/>");
 196                 pw.println("    <frame src='"+basename+"?frame=bottom' marginwidth=0 marginheight=0 name='bottom'/>");
 197             } else {
 198                 pw.println("  <frameset cols='150,*'>");
 199                 pw.println("    <frame src='"+basename+"?frame=topleft' marginwidth=0 marginheight=0 name=topleft/>");
 200                 pw.println("    <frame src='"+basename+"?frame=topright' marginwidth=0 marginheight=0 name=topright/>");
 201             }
 202             pw.println("  </frameset>");
 203             pw.println("</html>");
 204             pw.flush();
 205         }
 206
 207         public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
 208             String frame = request.getParameter("frame");
 209             String basename = request.getRequestURI();
 210
 211             if (frame == null) { frames(request, response, true); return; }
 212             if (frame.equals("top")) { frames(request, response, false); return; }
 213             if (frame.equals("banner")) { banner(request, response); return; }
 214             if (frame.equals("topleft")) { return; }
 215
 216             if (request.getServletPath().indexOf("..") != -1) throw new IOException(".. not allowed in image paths");
 217             ServletContext cx = getServletContext();
 218             String path = cx.getRealPath(request.getServletPath());
 219             Mailbox mbox = FileBasedMailbox.getFileBasedMailbox(path, false);
 220             if (mbox == null) throw new IOException("no such mailbox: " + path);
 221
 222             Vec msgs = new Vec();
 223             for(Mailbox.Iterator it = mbox.iterator(); it.next();) {
 224                 String[] s = new String[4];
 225                 Message m = it.cur();
 226                 s[0] = (m.from==null?"":m.from.toString(true));
 227                 s[1] = m.subject;
 228                 s[2] = (m.date + "").trim().replaceAll(" ","&nbsp;");
 229                 s[3] = it.imapNumber() + "";
 230                 msgs.addElement(s);
 231             }
 232             String[][] messages;
 233             msgs.copyInto(messages = new String[msgs.size()][]);
 234
 235             if ("bottom".equals(frame)) { bottom(request, response, messages, mbox); return; }
 236             if ("topright".equals(frame)) { topright(request, response, messages); return; }
 237         }
 238
 239         private void bottom(HttpServletRequest request, HttpServletResponse response, String[][] messages, Mailbox mbox)
 240             throws IOException {
 241             PrintWriter pw = new PrintWriter(response.getWriter());
 242             pw.println("<html>");
 243             pw.println("  <head>");
 244             pw.println("  <style>");
 245             pw.println("      body { margin: 10px; }");
 246             pw.println("      pre {");
 247             pw.println("         font-family: monospace;");
 248             pw.println("         background-color:  #F0F0E0;");
 249             pw.println("         color: rgb(0, 0, 0);");
 250             pw.println("         padding: 5px;");
 251             pw.println("         margin: 0px;");
 252             pw.println("         overflow: auto;");
 253             //pw.println("         width: 80%;");
 254             //pw.println("         border-style: solid;");
 255             //pw.println("         border-width: 1px;");
 256             pw.println("      }");
 257             pw.println("  </style>");
 258             pw.println("  </head>");
 259             pw.println("  <body>");
 260             if (request.getParameter("msgnum") != null) {
 261                 int target = Integer.parseInt(request.getParameter("msgnum"));
 262                 Mailbox.Iterator it = mbox.iterator();
 263                 while(it.next())
 264                     if (it.imapNumber() == target)
 265                         break;
 266                 if (it.cur() != null) {
 267                     pw.println("    <table width=100% border=0 cellspacing=0 style='border: 1px black solid; background-color:#F0F0E0;'>");
 268                     pw.println("      <tr style='border: 1px black solid; font-family: monospace'><td style='padding: 5px'>");
 269                     Headers h = it.cur().headers;
 270                     pw.println(" Subject: " + it.cur().subject +"<br>");
 271                     pw.println("    From: " + it.cur().from +"<br>");
 272                     pw.println("    Date: " + it.cur().date +"<br>");
 273                         /*
 274                     for(java.util.Enumeration e = h.names(); e.hasMoreElements();) {
 275                         String key = (String)e.nextElement();
 276                         if (key==null || key.length()==0 || key.equals("from") ||
 277                             key.equals("to") || key.equals("subject") || key.equals("date")) continue;
 278                         key = Character.toUpperCase(key.charAt(0)) + key.substring(1);
 279                         String val = h.get(key);
 280                         for(int i=key.length(); i<15; i++)pw.print(" ");
 281                         pw.print(key+": ");
 282                         pw.println(val);
 283                     }
 284                         */
 285                     pw.print("</td></tr><tr><td style='border-top: 1px black; border-top-style: dotted;'><pre>");
 286                     StringBuffer tgt = new StringBuffer();
 287                     it.cur().getBody().getStream().transcribe(tgt);
 288                     pw.println(tgt.toString());
 289                     pw.println("    </pre></td></tr></table>");
 290                 }
 291             }
 292             pw.println("  </body>");
 293             pw.println("</html>");
 294             pw.flush();
 295             pw.close();
 296         }
 297
 298         private void banner(HttpServletRequest request, HttpServletResponse response) throws IOException {
 299             String basename = request.getServletPath();
 300             String realpath = getServletContext().getRealPath(basename);
 301             /*
 302             MailingList list = MailingList.getMailingList(realpath);
 303             list.banner(request, response);
 304             */
 305             banner(request, response);
 306         }
 307
 308         private void topright(HttpServletRequest request, HttpServletResponse response, String[][] messages) throws IOException {
 309             PrintWriter pw = new PrintWriter(response.getWriter());
 310             String basename = request.getRequestURI();
 311             pw.println("<html>");
 312             pw.println("  <head>");
 313             pw.println("    <style>");
 314             pw.println("      TH, TD, P, LI {");
 315             pw.println("          font-family: helvetica, verdana, arial, sans-serif;");
 316             pw.println("          font-size: 12px;  ");
 317             pw.println("          text-decoration:none; ");
 318             pw.println("      }");
 319             pw.println("      body { margin: 10px; }");
 320             pw.println("      a:link    { color: #000; text-decoration: none; }");
 321             pw.println("      a:active  { color: #f00; text-decoration: none; }");
 322             pw.println("      a:visited { color: #777; text-decoration: none; }");
 323             pw.println("      a:hover   { color: #000; text-decoration: none; }");
 324             pw.println("      /* a:hover   { color: #00f; text-decoration: none; border-bottom: 1px dotted; } */");
 325             pw.println("    </style>");
 326             pw.println("  </head>");
 327             pw.println("  <body onKeyPress='doKey(event.keyCode)'>");
 328             pw.println("    <script>");
 329             pw.println("      var chosen = null;");
 330             pw.println("      var all = [];");
 331             pw.println("      function doKey(x) {");
 332             pw.println("          if (chosen == null) { choose(all[0]); return; }");
 333             pw.println("          switch(x) {");
 334             pw.println("              case 112: if (chosen.id > 0) choose(all[chosen.id-1]); break;");
 335             pw.println("              case 110: if (chosen.id < (all.length-1)) choose(all[1+(1*chosen.id)]); break;");
 336             pw.println("          }");
 337             pw.println("      }");
 338             pw.println("      function choose(who) {");
 339             pw.println("          who.style.background = '#ffc';");
 340             pw.println("          if (chosen != null) chosen.style.background = '#ccc';");
 341             pw.println("          parent.parent.bottom.location='"+basename+"?frame=bottom&msgnum='+who.id;");
 342             pw.println("          chosen = who;");
 343             pw.println("      }");
 344             pw.println("    </script>");
 345             pw.println("    <div style='border: 1px black solid;'><table width=100% border=0 cellpadding=0 cellspacing=0>");
 346             pw.println("    <tr><td style='padding: 4px' bgcolor=#eff7ff>");
 347             pw.flush();
 348             banner(request, response);
 349             pw.println("    </td></tr>");
 350             pw.println("    <tr><td>");
 351             pw.println("    <table width=100% cellpadding=0 cellspacing=0 style='border-top: 1px black solid; cursor:pointer;'>");
 352             boolean odd=true;
 353             for(int i=0; i<messages.length; i++) {
 354                 odd = !odd;
 355                 String[] m = messages[i];
 356                 pw.println("      <tr style='cursor:pointer; background: "+(odd?"#e8eef7":"white")+"' id='"+m[3]+"' "+
 357                            "onmouseover='this.style.color=\"blue\"' "+
 358                            "onmouseout='this.style.color=\"black\"' "+
 359                            "onclick='choose(this);'>");
 360                 pw.println("<td style='cursor:pointer; padding:5px; padding-bottom:2px'>"+m[0]+"</td>");
 361                 pw.println("<td style='cursor:pointer; padding:5px; padding-bottom:2px'>"+m[1]+"</td>");
 362                 pw.println("<td style='cursor:pointer; padding:5px; padding-bottom:2px'>"+m[2]+"</td>");
 363                 pw.println("</tr>");
 364                 pw.println("<script> all["+i+"] = document.getElementById('"+i+"'); </script>");
 365             }
 366             pw.println("    </table>");
 367             pw.println("    </td></tr>");
 368             pw.println("    </table></div>");
 369             pw.println("  </body>");
 370             pw.println("</html>");
 371             pw.flush();
 372             pw.close();
 373         }
 374     }
 375 }