[Sieve] Is the way to run external script to get attachment?

[Konstantin Shalygin]

Yes, I need Sieve for this, because actually I don't know sender or 
recipient.
Sieve script activate on some user in some time.

In fact, I did not read the specification 
*spec-bosch-sieve-extprograms.txt* on github (I use dovecot wiki old 
revisions) and generally was not attentive enough.

I wrote python script and this is works like a charm for month.

|require [ "vnd.dovecot.pipe", "variables" ]; if address :is :all "from" 
"k0ste at k0ste.ru" { pipe "sieve_to_owncloud"; } |

Incoming messages goes to script stdin, if script failed - messages 
delivered to mailbox, otherwise (script is ok) - message discarded.
On 02/16/2017 04:19 PM, Konstantin Khomoutov wrote:
> On Wed, 15 Feb 2017 17:13:31 +0700
> Konstantin Shalygin <k0ste at k0ste.ru> wrote:
>
>> Read all about Extprograms, but have a question.
>> Use case:
>> Every day we have couple messages with attachment (from one sender,
>> this is one-way communication). This attachment is uploads to
>> ownCloud. By hand... need some automation.
>> As I see, pipe cat execute scripts with text data USER/FROM/SUBJECT -
>> and I think with variables it can be any text data, how about
>> attachment?
>>
>> How I see this: script executes and as arg receives from sieve
>> attachment file, or message file and we can parse it for attachment.
>> When we have attachment - upload to ownCloud via RESTapi and purge
>> message.
>>
>> Found some realization for encrypt messages
>> https://github.com/EtiennePerot/gpgit/blob/master/encmaildir.sh
>> but for me more easy just connect to IMAP and do what I want (but I
>> love sieve).
> Do you really need Sieve for this?
>
> IMO such things are best handled in the SMTP server:
>
> 1) Set up an alias for the mail address receiving these mails.
>
> 2) Make that alias expand both to its real final destination
>     (an address, mails to which would be delivered to the IMAP
>     folder as before) and to a special "program" entry which looks
>     like "| /path/to/the/external/program".
>
> See `man aliases` [4] for more info.
>
> The program is supposed to receive the mail message to its standard
> input stream and do whatever it wishes with them.  For instance, this
> could be a shell script calling something like `ripmime` [1] on the
> input, saving the attachments and then calling into whatever would
> upload them.
>
> Note that if the program completed its task OK, it should return with
> the zero result code.  Otherwise it's advised to use one of result
> codes defined by Sendmail, which are described in [2] and whose exact
> numeric values could be googled (for instance, see [3]).  If your
> program return a "known" exit code on error, you'll get better
> diagnostics reported for that failure by your SMTP server.
>
> 1. http://www.pldaniels.com/ripmime/
> 2. http://docstore.mik.ua/orelly/networking/sendmail/ch36_05.htm
> 3. https://gist.github.com/bojanrajkovic/831993
> 4. http://www.postfix.org/aliases.5.html

-- 
Best regards,
Konstantin Shalygin