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From "Rick McGuire (JIRA)" <server-...@james.apache.org>
Subject [jira] Created: (JAMES-846) RemoteDelivery convertTo7Bit() can corrupt message content.
Date Wed, 25 Jun 2008 10:59:45 GMT
RemoteDelivery convertTo7Bit() can corrupt message content. 
------------------------------------------------------------

                 Key: JAMES-846
                 URL: https://issues.apache.org/jira/browse/JAMES-846
             Project: James
          Issue Type: Bug
            Reporter: Rick McGuire


This is something I ran into while fixing the Geronimo javamail bugs, and noticed that the
RemoteDelivery code has the same problem.  In the convertTo7Bit() method, the transfer encoding
is unconditionally set to either quoted-printable or base64 depending on the MIME type.  This
can make the content invalid when transmitted as mail 

To understand the reason, you need to understand how MimeMessage holds the content internally.
 The content can exist in one of two forms:  1)  The real content object, or 2) the content
encoded as a byte array.  In case 1), the Content-Transfer-Encoding indicates how the content
WILL BE encoded when written to a stream.   In case 2), the Content-Transfer-Encoding indicates
how the content IS encoded in the byte array.  In the first case, setting the transfer encoding
works ok.  In the second case, it's changing how the already encoded information will be interpreted.
 I've confirmed this to be the case with the Sun implementation as well. 

I ran into the reverse aspect of this problem with the implementation of the 8BITMIME support.
 It was not sufficient to just set the Content-Transfer-Encoding header to convert this to
8bit.  It was necessary to call getContent(), then set the same content back on the message.
  Once that was done, it was safe to change the Content-Transfer-Encoding header. 

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