src/org/ibex/mail/MIME.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 static org.ibex.mail.MailException.*;
   7 import org.ibex.crypto.*;
   8 import org.ibex.util.*;
   9 import org.ibex.mail.protocol.*;
  10 import org.ibex.js.*;
  11 import org.ibex.io.*;
  12 import org.ibex.io.Fountain;
  13 import java.util.*;
  14 import java.net.*;
  15 import java.io.*;
  16
  17 // FEATURE: MIME RFC2045, 2046, 2049
  18
  19 /** This class contains logic for encoding and decoding MIME multipart messages */
  20 public class MIME {
  21
  22     /** Part = Headers+Body */
  23     public static class Part extends JSReflection implements Fountain {
  24         public  final Headers      headers;
  25         public  final ContentType  contentType;
  26         private final String       encoding;
  27
  28         private final Fountain     all;
  29         private final Fountain     body;
  30
  31         public Stream getStream()   { return all.getStream(); }
  32         public int getNumLines()    { return all.getNumLines(); }
  33         public long getLength()     { return all.getLength(); }
  34         public Fountain getBody()   { return body; }
  35
  36         public Part(Fountain all) {
  37             this.headers     = new Headers(all);
  38             String ctype     = headers.get("content-type");
  39             this.encoding    = headers.get("content-transfer-encoding");
  40             String enc = this.encoding;
  41             if (enc!=null) enc = enc.toLowerCase();
  42             if (!(enc == null || enc.equals("7bit") || enc.equals("8bit") || enc.equals("binary") ||
  43                   enc.equals("quoted-printable") || enc.equals("base64"))) {
  44                 Log.warn(MIME.class, "unknown TransferEncoding \"" + encoding + "\"");
  45                 ctype = "application/octet-stream";
  46             }
  47             this.contentType = new ContentType(ctype, headers.get("content-description"), headers.get("content-id"), encoding);
  48             this.all = all;
  49             this.body = new Fountain() {
  50                     public int getNumLines()  { return Stream.countLines(getStream()); }
  51                     public long getLength()   { return Part.this.getLength() - headers.getLength() - 2 /*CRLF*/; }
  52                     public Stream getStream() { return transformBodyStream(Headers.skip(Part.this.all.getStream())); }
  53                 };
  54         }
  55
  56         private Stream transformBodyStream(Stream body) {
  57             //"quoted-printable".equals(encoding) ? Encode.QuotedPrintable.decode(body.toString(),false) :
  58             //"base64".equals(encoding)           ? Encode.fromBase64(body.toString()) :
  59             return body;
  60         }
  61
  62         /*
  63         public Part getPart(int i) {
  64             Stream stream = body.getStream();
  65             Vec v = new Vec();
  66             // first part begins with a boundary delimiter
  67             for(String s = stream.readln(); s != null; s = stream.readln())
  68                 if (s.equals("--" + contentType.parameters.get("boundary"))) break;
  69             while(true) {
  70                 Stream substream = new BoundaryStream(stream, (String)contentType.parameters.get("boundary"));
  71                 Part p = new Part(substream, true, null); // FIXME split off headers
  72                 v.addElement(p);
  73                 if (substream.isLast()) break;
  74             }
  75             return parts = (Part[])v.copyInto(new Part[v.size()]);
  76         }
  77         */
  78     }
  79
  80     /*
  81     public static class Boundary implements Stream.Transformer {
  82         private final String boundary;
  83         private boolean done = false;
  84         private boolean last = false;
  85         public Boundary(String bounardy) { this.boundary = boundary; }
  86         public boolean isLast() { while(!done) readln(); return last; }
  87         public Stream transform(Stream stream) {
  88             for(String s = stream.readln(); s != null; s = stream.readln()) {
  89                 if (boundary != null && (s.equals(boundary) || s.equals(boundary + "--"))) {
  90                     body.setLength(body.length() - 2);  // preceeding CRLF is part of delimiter
  91                     last = s.equals(boundary + "--");
  92                     done = true;
  93                     break;
  94                 }
  95                 body.append(s);
  96                 body.append("\r\n");
  97                 //lines++;
  98             }
  99         }
 100     }
 101     */
 102 }