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 JS get(JS key) throws JSExn {
  37             String k = JSU.toString(key);
  38             if ("body".equals(k)) {
  39                 StringBuffer sb = new StringBuffer();
  40                 getBody().getStream().transcribe(sb);
  41                 return JSU.S(sb.toString());
  42             }
  43             return super.get(key);
  44         }
  45
  46         public Part(final Fountain fount, String[] keyval) {
  47             Headers h        = new Headers(fount);
  48             this.headers     = keyval==null ? h : new Headers(h, keyval);
  49             String ctype     = headers.get("content-type");
  50             this.encoding    = headers.get("content-transfer-encoding");
  51             String enc = this.encoding;
  52             if (enc!=null) enc = enc.toLowerCase();
  53             if (!(enc == null || enc.equals("7bit") || enc.equals("8bit") || enc.equals("binary") ||
  54                   enc.equals("quoted-printable") || enc.equals("base64"))) {
  55                 Log.warn(MIME.class, "unknown TransferEncoding \"" + encoding + "\"");
  56                 ctype = "application/octet-stream";
  57             }
  58             this.contentType = new ContentType(ctype, headers.get("content-description"), headers.get("content-id"), encoding);
  59             // FIXME: this is a horrible, tangled mess.
  60             this.body = new Fountain() {
  61                     public int getNumLines()  { return Stream.countLines(this.getStream()); }
  62                     public long getLength()   { return Stream.countBytes(this.getStream()); }
  63                     public Stream getStream() { return transformBodyStream(Headers.skip(fount.getStream())); }
  64                 };
  65             this.all =
  66                 keyval==null
  67                 ? fount
  68                 : Fountain.Util.concat(this.headers, Fountain.Util.create("\r\n"), this.body);
  69         }
  70
  71         private Stream transformBodyStream(Stream body) {
  72             //"quoted-printable".equals(encoding) ? Encode.QuotedPrintable.decode(body.toString(),false) :
  73             //"base64".equals(encoding)           ? Encode.fromBase64(body.toString()) :
  74             return body;
  75         }
  76
  77         /*
  78         public Part getPart(int i) {
  79             Stream stream = body.getStream();
  80             Vec v = new Vec();
  81             // first part begins with a boundary delimiter
  82             for(String s = stream.readln(); s != null; s = stream.readln())
  83                 if (s.equals("--" + contentType.parameters.get("boundary"))) break;
  84             while(true) {
  85                 Stream substream = new BoundaryStream(stream, (String)contentType.parameters.get("boundary"));
  86                 Part p = new Part(substream, true, null); // FIXME split off headers
  87                 v.addElement(p);
  88                 if (substream.isLast()) break;
  89             }
  90             return parts = (Part[])v.copyInto(new Part[v.size()]);
  91         }
  92         */
  93     }
  94
  95     /*
  96     public static class Boundary implements Stream.Transformer {
  97         private final String boundary;
  98         private boolean done = false;
  99         private boolean last = false;
 100         public Boundary(String bounardy) { this.boundary = boundary; }
 101         public boolean isLast() { while(!done) readln(); return last; }
 102         public Stream transform(Stream stream) {
 103             for(String s = stream.readln(); s != null; s = stream.readln()) {
 104                 if (boundary != null && (s.equals(boundary) || s.equals(boundary + "--"))) {
 105                     body.setLength(body.length() - 2);  // preceeding CRLF is part of delimiter
 106                     last = s.equals(boundary + "--");
 107                     done = true;
 108                     break;
 109                 }
 110                 body.append(s);
 111                 body.append("\r\n");
 112                 //lines++;
 113             }
 114         }
 115     }
 116     */
 117 }