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From "Stefano Bagnara (JIRA)" <mime4j-...@james.apache.org>
Subject [jira] Resolved: (MIME4J-176) Wrong CRLF usage in multipart.writeTo
Date Sat, 27 Mar 2010 21:20:27 GMT

     [ https://issues.apache.org/jira/browse/MIME4J-176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stefano Bagnara resolved MIME4J-176.
------------------------------------

    Resolution: Fixed

At least for the preamble this is resolved and my dkim issue is fixed. I had no time to deeply
study the epilogue status.

> Wrong CRLF usage in multipart.writeTo
> -------------------------------------
>
>                 Key: MIME4J-176
>                 URL: https://issues.apache.org/jira/browse/MIME4J-176
>             Project: JAMES Mime4j
>          Issue Type: Bug
>          Components: dom
>    Affects Versions: 0.6
>            Reporter: Stefano Bagnara
>            Assignee: Stefano Bagnara
>             Fix For: 0.7
>
>
> MessageWriter currently has this code:
>         writeBytes(preamble, out);
>         out.write(CRLF);
> and 
>         out.write(CRLF);
>         writeBytes(epilogue, out);
> This is correct only when epilogue and preamble exists in the original message, otherwise
it introduces a one empty line epilogue/preamble that was not present in the original message.
> RFC clearly states that the CRLF after the preamble can be added only when a preamble
exists (the same for the CRLF before the epilogue) 
>      multipart-body := [preamble CRLF]
>                        dash-boundary transport-padding CRLF
>                        body-part *encapsulation
>                        close-delimiter transport-padding
>                        [CRLF epilogue]
> So, roundtripping doesn't currently work for messages with no preamble or no epilogue,
introducing a new empty line in the output stream.
> As an example this make it impossible to DKIM sign and validate messages with empty epilogue/prologue
and it breaks DKIM signatures for such messages (this is true with the "simple" canonicalization
method).

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