CryptoAttachment


1   package net.suberic.pooka.crypto;
2   
3   import net.suberic.pooka.*;
4   import net.suberic.crypto.*;
5   
6   import javax.mail.internet.*;
7   import javax.mail.*;
8   import javax.activation.DataHandler  ;
9   
10  import java.security.Key  ;
11  
12  import java.io.*;
13  
14  /**
15   * An encrypted attachment.
16   */
17  public class CryptoAttachment extends Attachment {
18  
19    boolean parsed = false;
20  
21    boolean encrypted = false;
22  
23    boolean signed = false;
24  
25    BodyPart decryptedBodyPart = null;
26    
27    DataHandler   msgDataHandler = null;
28  
29    /**
30     * Creates a CryptoAttachment out of a MimePart.
31     */
32    public CryptoAttachment(MimePart mp) throws MessagingException {
33      super(mp);
34      ContentType ct = new ContentType(mp.getContentType());
35      if (ct.getSubType().equalsIgnoreCase("encrypted"))
36        encrypted = true;
37      else if (ct.getSubType().equalsIgnoreCase("signed"))
38        signed = true;
39      else if (ct.getPrimaryType().equalsIgnoreCase("application") && ct.getSubType().equalsIgnoreCase("pkcs7-mime")) {
40        encrypted = true;
41      }
42    }
43  
44    /**
45     * Tries to decrypt this Attachment.
46     */
47    public BodyPart decryptAttachment(EncryptionUtils utils, Key   key)
48      throws MessagingException, java.io.IOException  , java.security.GeneralSecurityException   {
49      
50      if (decryptedBodyPart != null)
51        return decryptedBodyPart;
52      else {
53        MimeBodyPart mbp = new MimeBodyPart();
54        mbp.setDataHandler(super.getDataHandler());
55        mbp.setHeader("Content-Type", super.getDataHandler().getContentType());
56  
57        decryptedBodyPart = utils.decryptBodyPart(mbp, key);
58  
59        return decryptedBodyPart;
60      }
61      
62    }
63  
64    // accessor methods.
65    
66    /**
67     * Returns the text of the Attachment, up to maxLength bytes.  If 
68     * the content is truncated, then append the truncationMessage at the
69     * end of the content displayed.
70     *
71     * If withHeaders is set, then show the Headers to go with this message.
72     * If showFullHeaders is also set, then show all the headers.  
73     */
74    public String   getText(boolean withHeaders, boolean showFullHeaders, int maxLength, String   truncationMessage) throws java.io.IOException   {
75      StringBuffer   retVal = new StringBuffer  ();
76      if (withHeaders)
77        retVal.append(getHeaderInformation(showFullHeaders));
78      
79      retVal.append(Pooka.getProperty("Pooka.crypto.encryptedMessage", "******  This is an encrypted message.  Click on the 'encryption' button or go to Encrypt->Decrypt message to read it. ******"));
80      
81      return retVal.toString();
82    }
83  
84    /**
85     * Returns if we have already decrypted this attachment successfully.
86     */
87    public boolean decryptedSuccessfully() {
88      return (decryptedBodyPart != null);
89    }
90    
91  }
92
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