Re: IMAP REPLACE extension

Hi Stu,
This is a very good start, thank you for doing this!

On 29/04/2015 14:45, Stu Brandt wrote:
> As promised, here's a draft of a REPLACE extension.
>
> Since the most obvious question is going to be "Why REPLACE and not an 
> option on APPEND?",  I'll answer it straight away...
>
> First, APPEND is valid in the authenticated state. REPLACE requires 
> the selected state. I chose not to generate a mixed state scenario for 
> APPEND. Secondly, REPLACE is similar to MOVE in that it avoids a 
> number of issues that come with a serialized non-atomic sequence 
> attempting to perform a single operation. MOVE is not an option on 
> COPY, so I chose to follow the same precedent.
>
> Here's the writeup.
  [snip]
> 3.2. REPLACE Command
  [snip]
> Example:
>      C: A003 REPLACE 4 Drafts (\Seen \Draft) {312}
>      S: + Ready for literal data
>      C: Date: Thu, 1 Jan 2015 00:05:00 -0500 (EST)
>      C: From: Fritz Schmidt <[email protected]>
>      C: Subject: happy new year !!
>      C: To: [email protected]
>      C: Message-Id: <[email protected]>
>      C: MIME-Version: 1.0
>      C: Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
>      C:
>      C: Just saw the best fireworks show. Wish you were here.
>      C:
>      S: * 4 EXPUNGE
>      S: A003 OK [APPENDUID 1 2000] Replace completed
I think an untagged APPENDUID should be issued before expunge, so that 
the client can safely correlate the old and the new message, without
>
> 3.3.  UID REPLACE Command
>
>    This extends the first form of the UID command (see [RFC3501]
>    Section 6.4.8) to add the REPLACE command defined above as a valid
>    argument.  This form of REPLACE uses a UID rather than sequence
>    number as its first parameter.
>
>    Example:
>      C: A004 UID REPLACE 2000 Drafts (\Seen \Draft) {350}
>      S: + Ready for literal data
>      C: Date: Thu, 1 Jan 2015 00:06:00 -0500 (EST)
>      C: From: Fritz Schmidt <[email protected]>
>      C: Subject: happy new year !!
>      C: To: [email protected]
>      C: Message-Id: <[email protected]>
>      C: MIME-Version: 1.0
>      C: Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
>      C:
>      C: Just saw the best fireworks show. Wish you were here.
>      C: Hopefully next year you can join us.
>      C:
>      S: * 4 EXPUNGE
>      S: A004 OK [APPENDUID 1 2001] Replace completed
As above.

> 4. Interaction with other extensions
>
>    This section describes how REPLACE interacts with some other IMAP
>    extensions.
>
> Brandt                  Expires October 31, 2015 [Page 5]
> Internet-Draft           IMAP REPLACE Extension April 2015
>
> 4.1.  RFC 4314, ACL
>
>    The ACL rights [RFC4314] required for UID REPLACE are the union of
>    the ACL rights required for UID STORE, UID EXPUNGE,
Just to make this clearer, I would add "in the current mailbox"
> and APPEND.
"In the target mailbox".

Best Regards,
Alexey

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