Hi Alexey,
On 3/10/2013 3:01 PM, Alexey Melnikov wrote:
On 9 Mar 2013, at 11:08, Stephan Bosch <stephan(_at_)rename-it(_dot_)nl> wrote:
I made a new version of the "duplicate" draft. It should address the comments
by Ned and Alexey.
Any thoughts about this?
This looks much better, thank you.
One new issue is that I don't understand how :value works. Maybe it is a Sunday
morning effect. Maybe you can show an example or two?
To detect duplicates, some more or less unique identifying string value
must be extracted from the message and compared between deliveries. For
most cases, the contents of the Message-ID header is the best choice;
that is what it is meant for. However, to accommodate more complex uses,
the duplicate test has the flexibility to choose a different string
value for comparison. Using the :value argument, the string value can be
set manually to an arbitrary string. Typically, one would compose this
string using variable substitutions. One can for example compose it from
parts of a header, the envelope, multiple headers, parts of the message
body or even the current date; whatever is appropriate for the application.
There is one example of the use of :value in the draft (the second one).
I should perhaps make the subject header structure a bit more complex to
justify its use in this example (because :header would work here as well).
Another example would be the following scenario. A mail user receives
XMPP notifications about new mail through Sieve. Sometimes a single
contact sends many messages in a short period of time and the user wants
to prevent being notified of all of those messages. He wants to be
notified about messages from each person at most once per 30 minutes. He
writes the following script:
require ["variables", "envelope","enotify", "duplicate"];
if envelope :matches "from" "*" { set "sender" "${1}"; }
if header :matches "subject" "*" { set "subject" "${1}"; }
if not duplicate :seconds 1800 :value "${sender}") {
notify :message "[SIEVE] ${from}: ${subject}"
"xmpp:user(_at_)im(_dot_)example(_dot_)com";
}
So this example uses the message envelope sender rather than the
Message-ID header as an identifier for duplicate checking.
This example can be extended to allow multiple messages from the same
sender in close succession as long as the discussed topic is different.
This could be done as follows:
require ["variables", "envelope","enotify", "duplicate"];
if envelope :matches "from" "*" { set "sender" "${1}"; }
if header :matches "subject" "*" { set "subject" "${1}"; }
if string :comparator "i;ascii-casemap" :matches "${subject}" "Re:*" {
set "topic" "${1}";
} else {
set "topic" "${subject}";
}
if not duplicate :seconds 1800 :value "${sender} ${topic}") {
notify :message "[SIEVE] ${from}: ${topic}"
"xmpp:user(_at_)im(_dot_)example(_dot_)com";
}
Regards,
Stephan.
_______________________________________________
sieve mailing list
sieve(_at_)ietf(_dot_)org
https://www.ietf.org/mailman/listinfo/sieve