Writing an custom imap command

[Timo Sirainen]

On 5. May 2021, at 17.28, Ryan Beethe <ryan at splintermail.com> wrote:
> 
>>>> You probably shold look some much more simple commands as
>>>> insipiration. Try looking e.g. how cmd_id is implemented instead.
>>> 
>>> I implemented a simpler command as well, but because it was simple I
>>> didn't have any questions :)
>>> 
>>> Unfortunately I do need a long-running command more like IDLE as well.
>> 
>> What kind of "long running command" did you have in mind?
> 
> My email service offers a layer of encryption which is not transparent
> to IMAP, and where the keys are created and kept on each client device.
> Since IMAP synchronization is bidirectional, each client needs to
> encrypt uploaded messages to all known client devices.  Thus, clients
> need a way update their list of all known keys.
> 
> So the command is roughly:
> 
>    tag XKEYSYNC [known_fingerprint ...]
>    ...
>    DONE
> 
> And the responses are rougly:
> 
>    * XKEYSYNC DELETED fingerprint
> 
>    * XKEYSYNC CREATED public_key
> 
> The full source can be found at:
> 
> github.com/splintermail/splintermail-client/blob/dev/server/xkeysync.c <http://github.com/splintermail/splintermail-client/blob/dev/server/xkeysync.c>

These look rather simple commands. Like Aki said, look at the simple commands for examples rather than the more complicated IDLE and APPEND commands which have various special cases.

But do you have to implement these command extensions? Looks like it would be much easier to just use the IMAP METADATA extension and store them in the server metadata.
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