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Ralf Becker

2020-Aug-03 19:58 UTC

How to access mailbox metadata in Lua push driver

Some answers to my questions, a first version of my script and more
questions ;)

Am 03.08.20 um 18:15 schrieb Ralf Becker:
> Currently looking into the following questions:
>
> - can I get the rfc 5423 type of event somehow (obviously I can set it
> on the event myself depending of the function called)
event.name> - looking at the example code, it looks like it can be called for
> multiple messages, when does that happen (LMTP send more then one)
still no idea, maybe Ake?

I noticed that some events have the same uid-validity, are the from a
single transaction, eg. I delete my Trash?
> - why is the mailbox status put into an other structure and send with
> a different notifiction
> - does anyone have a code snippet to send a JSON encoded message
> (probably easy to figure out looking at Lua docu)
these two I managed to solve im my current version of the script, which
also support now all message event types:

-- To use -- -- plugin { -- push_notification_driver
lua:file=/etc/dovecot/dovecot-push.lua -- push_lua_url
http://push.notification.server/handler -- } -- -- server is sent a PUT
message with JSON body like push_notification_driver ox:url=<push_lua_url>
user_from_metadata -- local http = require "socket.http" local ltn12 =
require "ltn12" -- luarocks install json-lua local json = require
"JSON" function table_get(t, k, d)
  return t[k] or d end function script_init()
  return 0 end function dovecot_lua_notify_begin_txn(user)
    local meta =
user:metadata_get("/private/vendor/vendor.dovecot/http-notify")
    return {user=user, event=dovecot.event(),
ep=user:plugin_getenv("push_lua_url"), messages={}, meta=meta}
end function dovecot_lua_notify_event_message_new(ctx, event)
    -- check if there is a push token registered if (ctx.meta == nil or ctx.meta
== '') then return end -- get mailbox status local mbox =
ctx.user:mailbox(event.mailbox)
    mbox:sync()
    local status = mbox:status(dovecot.storage.STATUS_RECENT,
dovecot.storage.STATUS_UNSEEN, dovecot.storage.STATUS_MESSAGES)
    mbox:free()
    table.insert(ctx.messages, {
      user = ctx.meta,
      ["imap-uidvalidity"] = event.uid_validity,
      ["imap-uid"] = event.uid,
      folder = event.mailbox,
      event = event.name,
      from = event.from,
      subject = event.subject,
      snippet = event.snippet,
      unseen = status.unseen
    })
end function dovecot_lua_notify_event_message_append(ctx, event)
  dovecot_lua_notify_event_message_new(ctx, event)
end function dovecot_lua_notify_event_message_read(ctx, event)
    -- check if there is a push token registered if (ctx.meta == nil or ctx.meta
== '') then return end -- get mailbox status local mbox =
ctx.user:mailbox(event.mailbox)
    mbox:sync()
    local status = mbox:status(dovecot.storage.STATUS_RECENT,
dovecot.storage.STATUS_UNSEEN, dovecot.storage.STATUS_MESSAGES)
    mbox:free()
    table.insert(ctx.messages, {
        user = ctx.meta,
        ["imap-uidvalidity"] = event.uid_validity,
        ["imap-uid"] = event.uid,
        folder = event.mailbox,
        event = event.name,
        unseen = status.unseen
    })
end function dovecot_lua_notify_event_message_trash(ctx, event)
    dovecot_lua_notify_event_message_read(ctx, event)
end function dovecot_lua_notify_event_message_expunge(ctx, event)
    dovecot_lua_notify_event_message_read(ctx, event)
end function dovecot_lua_notify_event_flags_set(ctx, event)
    -- check if there is a push token registered if (ctx.meta == nil or ctx.meta
== '') then return end table.insert(ctx.messages, {
        user = ctx.meta,
        ["imap-uidvalidity"] = event.uid_validity,
        ["imap-uid"] = event.uid,
        folder = event.mailbox,
        event = event.name,
        flags = event.flags,
        ["keywords-set"] = event.keywords_set
    })
end function dovecot_lua_notify_event_flags_clear(ctx, event)
    -- check if there is a push token registered if (ctx.meta == nil or ctx.meta
== '') then return end table.insert(ctx.messages, {
        user = ctx.meta,
        ["imap-uidvalidity"] = event.uid_validity,
        ["imap-uid"] = event.uid,
        folder = event.mailbox,
        event = event.name,
        flags = event.flags,
        ["keywords-clear"] = event.keywords_clear,
        ["keywords-old"] = event.keywords_old
    })
end function dovecot_lua_notify_end_txn(ctx)
    -- report all states for i,msg in ipairs(ctx.messages) do local e =
dovecot.event(ctx.event)
    e:set_name("lua_notify_mail_finished")
    reqbody = json:encode(msg)
    e:log_debug(ctx.ep .. " - sending " .. reqbody)
    res, code = http.request({
        method = "PUT",
        url = ctx.ep,
        source = ltn12.source.string(reqbody),
        headers={
            ["content-type"] = "application/json;
charset=utf-8",
            ["content-length"] = tostring(#reqbody)
        }
    })
    e:add_int("result_code", code)
    e:log_info("Mail notify status " .. tostring(code))
    end end


This leads to a couple more questions ;)

- is there a way (eg. return value) to stop event processing already in
dovecot_lua_notify_begin_txn

- sometimes multiple events are generated, eg. when I read an email:

{"event":"FlagsClear","flags":[],"folder":"INBOX/eGroupWare/calconnect","imap-uid":2275,"imap-uidvalidity":1499767470,"keywords-old":[],"user":"user=5::42;***"}
{"event":"FlagsSet","flags":["\\Seen"],"folder":"INBOX/eGroupWare/calconnect","imap-uid":2275,"imap-uidvalidity":1499767470,"user":"user=5::42;***"}
{"event":"MessageRead","folder":"INBOX/eGroupWare/calconnect","imap-uid":2275,"imap-uidvalidity":1499767470,"unseen":0,"user":"user=5::42;***"}

Ralf

-- 
Ralf Becker
EGroupware GmbH [www.egroupware.org]
Handelsregister HRB Kaiserslautern 3587
Gesch?ftsf?hrer Birgit und Ralf Becker
Leibnizstr. 17, 67663 Kaiserslautern, Germany
Telefon +49 631 31657-0

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Ralf Becker

2020-Aug-04 09:42 UTC

head link

Errors in Lua push docu

https://doc.dovecot.org/configuration_manual/push_notification/#message-events


  *

    dovecot_lua_notify_event_flags_set(context, {name, mailbox, uid,
    uid_validity, flags, keywords_set})

--> dovecot_lua_notify_event_flags_set(context, {name, mailbox, uid,
uid_validity, flags, keywords})

Called when message flags or keywords are set. flags is a bitmask.
keywords_set is a table of strings of the keywords set by the event.

  *

    dovecot_lua_notify_event_flags_clear(context, {name, mailbox, uid,
    uid_validity, flags, keywords_clear, keywords_old})

--> dovecot_lua_notify_event_flags_clear(context, {name, mailbox, uid,
uid_validity, flags, flags_old, keywords, keywords_old})

Ralf

-- 
Ralf Becker
EGroupware GmbH [www.egroupware.org]
Handelsregister HRB Kaiserslautern 3587
Gesch?ftsf?hrer Birgit und Ralf Becker
Leibnizstr. 17, 67663 Kaiserslautern, Germany
Telefon +49 631 31657-0

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Aki Tuomi

2020-Aug-04 09:55 UTC

head link

How to access mailbox metadata in Lua push driver

> On 03/08/2020 22:58 Ralf Becker <rb at egroupware.org> wrote:
> 
> 
> Some answers to my questions, a first version of my script and more
questions ;)
> 
> Am 03.08.20 um 18:15 schrieb Ralf Becker:
> > Currently looking into the following questions:
> > 
> > 
> > - can I get the rfc 5423 type of event somehow (obviously I can set it
on the event myself depending of the function called)
> event.name
> 
> > - looking at the example code, it looks like it can be called for
multiple messages, when does that happen (LMTP send more then one)
> > 
> still no idea, maybe Ake?
> I noticed that some events have the same uid-validity, are the from a
single transaction, eg. I delete my Trash?
> 
Because these events also apply for more than just LMTP. You could be storing
bunch of mails with IMAP APPEND.
> > - why is the mailbox status put into an other structure and send with
a different notifiction
The LUA code very faitfully implements the C API for push notifications in
Dovecot.
> > - does anyone have a code snippet to send a JSON encoded message
(probably easy to figure out looking at Lua docu)
> these two I managed to solve im my current version of the script, which
also support now all message event types:
<snip7>
> 
> This leads to a couple more questions ;)
> - is there a way (eg. return value) to stop event processing already in
dovecot_lua_notify_begin_txn
There is no really good way to do this. You can error out in begin_txn, but that
will emit error.

The only doable way, right now, is to maybe add key {disabled=True} to your
context, and then add

if ctx.disabled:
  return 

elsewhere.

> - sometimes multiple events are generated, eg. when I read an email:
>
{"event":"FlagsClear","flags":[],"folder":"INBOX/eGroupWare/calconnect","imap-uid":2275,"imap-uidvalidity":1499767470,"keywords-old":[],"user":"user=5::42;***"}
> 
{"event":"FlagsSet","flags":["\\Seen"],"folder":"INBOX/eGroupWare/calconnect","imap-uid":2275,"imap-uidvalidity":1499767470,"user":"user=5::42;***"}
> 
{"event":"MessageRead","folder":"INBOX/eGroupWare/calconnect","imap-uid":2275,"imap-uidvalidity":1499767470,"unseen":0,"user":"user=5::42;***"}
> 
This is what happens when you read unseen mail.
> Ralf
>  
> 
> -- 
> Ralf Becker
> EGroupware GmbH [www.egroupware.org (http://www.egroupware.org)]
> Handelsregister HRB Kaiserslautern 3587
> Gesch?ftsf?hrer Birgit und Ralf Becker
> Leibnizstr. 17, 67663 Kaiserslautern, Germany
> Telefon +49 631 31657-0
>
Aki

Ralf Becker

2020-Aug-04 15:11 UTC

head link

How to access mailbox metadata in Lua push driver

In case someone is interested this is the final version of the script:

-- To use -- -- plugin { -- push_notification_driver
lua:file=/etc/dovecot/dovecot-push.lua -- push_lua_url
https://Bearer:<push-token>@<egroupware-domain>/egroupware/push -- }
--
-- server is sent a PUT message with JSON body like
push_notification_driver = ox:url=<push_lua_url> user_from_metadata --
plus additionally the events MessageAppend, MessageExpunge, FlagsSet and
FlagsClear -- MessageTrash and MessageRead are ignored, so are empty
FlagSet/Clear or FlagSet NonJunk (TB) -- local http = require
"socket.http" local ltn12 = require "ltn12" -- luarocks
install json-lua local json = require "JSON" function table_get(t, k,
d)
  return t[k] or d end function script_init()
  return 0 end function dovecot_lua_notify_begin_txn(user)
    local meta =
user:metadata_get("/private/vendor/vendor.dovecot/http-notify")
    if (meta == nil or meta:sub(1,5) ~= "user=")
    then meta = nil;
    else meta = meta:sub(6)
    end return {user=user, event=dovecot.event(),
ep=user:plugin_getenv("push_lua_url"), messages={}, meta=meta}
end function dovecot_lua_notify_event_message_new(ctx, event)
    -- check if there is a push token registered if (ctx.meta == nil) then
return end -- get mailbox status local mbox = ctx.user:mailbox(event.mailbox)
    mbox:sync()
    local status = mbox:status(dovecot.storage.STATUS_RECENT,
dovecot.storage.STATUS_UNSEEN, dovecot.storage.STATUS_MESSAGES)
    mbox:free()
    table.insert(ctx.messages, {
        user = ctx.meta,
        ["imap-uidvalidity"] = event.uid_validity,
        ["imap-uid"] = event.uid,
        folder = event.mailbox,
        event = event.name,
        from = event.from,
        subject = event.subject,
        snippet = event.snippet,
        unseen = status.unseen,
        messages = status.messages
    })
end function dovecot_lua_notify_event_message_append(ctx, event)
  dovecot_lua_notify_event_message_new(ctx, event)
end -- ignored, as FlagSet flags=[\Seen] is sent anyway too -- function
dovecot_lua_notify_event_message_read(ctx, event) --
dovecot_lua_notify_event_message_expunge(ctx, event) -- end -- ignored,
as most MUA nowadays expunge immediatly -- function
dovecot_lua_notify_event_message_trash(ctx, event) --
dovecot_lua_notify_event_message_expunge(ctx, event) -- end function
dovecot_lua_notify_event_message_expunge(ctx, event)
    -- check if there is a push token registered if (ctx.meta == nil) then
return end -- get mailbox status local mbox = ctx.user:mailbox(event.mailbox)
    mbox:sync()
    local status = mbox:status(dovecot.storage.STATUS_RECENT,
dovecot.storage.STATUS_UNSEEN, dovecot.storage.STATUS_MESSAGES)
    mbox:free()
    -- agregate multiple Expunge (or Trash or Read) if (#ctx.messages == 1 and
ctx.messages[1].user == ctx.meta and ctx.messages[1].folder == event.mailbox and
ctx.messages[1]["imap-uidvalidity"] == event.uid_validity and
ctx.messages[1].event == event.name)
    then if (type(ctx.messages[1]["imap-uid"]) ~= 'table')
then ctx.messages[1]["imap-uid"] =
{ctx.messages[1]["imap-uid"]}
        end table.insert(ctx.messages[1]["imap-uid"], event.uid)
        ctx.messages[1].unseen = status.unseen
        ctx.messages[1].messages = status.messages
        return;
    end table.insert(ctx.messages, {
        user = ctx.meta,
        ["imap-uidvalidity"] = event.uid_validity,
        ["imap-uid"] = event.uid,
        folder = event.mailbox,
        event = event.name,
        unseen = status.unseen,
        messages = status.messages
    })
end function dovecot_lua_notify_event_flags_set(ctx, event)
    -- check if there is a push token registered if (ctx.meta == nil or
(#event.flags == 0 and #event.keywords == 0) or -- ignore TB sends it empty
(#event.keywords == 1 and event.keywords[1] == "NonJunk")) -- ignore
TB NonJunk then return end local status = nil;
    if (#event.flags == 1 and event.flags[1] == "\\Seen")
    then -- get mailbox status local mbox = ctx.user:mailbox(event.mailbox)
        mbox:sync()
        status = mbox:status(dovecot.storage.STATUS_RECENT,
dovecot.storage.STATUS_UNSEEN, dovecot.storage.STATUS_MESSAGES)
        mbox:free()
    end -- agregate multiple FlagSet if (#ctx.messages == 1 and
ctx.messages[1].user == ctx.meta and ctx.messages[1].folder == event.mailbox and
ctx.messages[1]["imap-uidvalidity"] == event.uid_validity and
ctx.messages[1].event == event.name and arrayEqual(ctx.messages[1].flags,
event.flags) and arrayEqual(ctx.messages[1].keywords, event.keywords))
    then if (type(ctx.messages[1]["imap-uid"]) ~= 'table')
then ctx.messages[1]["imap-uid"] =
{ctx.messages[1]["imap-uid"]}
        end table.insert(ctx.messages[1]["imap-uid"], event.uid)
        if (status ~= nil)
        then ctx.messages[1].unseen = status.unseen
        end return;
    end table.insert(ctx.messages, {
        user = ctx.meta,
        ["imap-uidvalidity"] = event.uid_validity,
        ["imap-uid"] = event.uid,
        folder = event.mailbox,
        event = event.name,
        flags = event.flags,
        keywords = event.keywords,
        unseen = status.unseen
    })
end function arrayEqual(t1, t2)
    if (#t1 ~= #t2)
    then return false end if (#t1 == 1 and t1[1] == t2[1])
    then return true end return json:encode(t1) == json:encode(t2)
end function dovecot_lua_notify_event_flags_clear(ctx, event)
    -- check if there is a push token registered AND something to clear (TB
sends it empty) if (ctx.meta == nil or (#event.flags == 0 and #event.keywords ==
0)) then return end table.insert(ctx.messages, {
        user = ctx.meta,
        ["imap-uidvalidity"] = event.uid_validity,
        ["imap-uid"] = event.uid,
        folder = event.mailbox,
        event = event.name,
        flags = event.flags,
        ["flags-old"] = event.flags_old,
        keywords = event.keywords,
        ["keywords-old"] = event.keywords_old
    })
end function dovecot_lua_notify_end_txn(ctx)
    -- report all states for i,msg in ipairs(ctx.messages) do local e =
dovecot.event(ctx.event)
        e:set_name("lua_notify_mail_finished")
        reqbody = json:encode(msg)
        e:log_debug(ctx.ep .. " - sending " .. reqbody)
        res, code = http.request({
            method = "PUT",
            url = ctx.ep,
            source = ltn12.source.string(reqbody),
            headers={
                ["content-type"] = "application/json;
charset=utf-8",
                ["content-length"] = tostring(#reqbody)
            }
        })
        e:add_int("result_code", code)
        e:log_info("Mail notify status " .. tostring(code))
    end end

It's also in our Github repo:
https://raw.githubusercontent.com/EGroupware/swoolepush/master/doc/dovecot-push.lua

Ralf

-- 
Ralf Becker
EGroupware GmbH [www.egroupware.org]
Handelsregister HRB Kaiserslautern 3587
Gesch?ftsf?hrer Birgit und Ralf Becker
Leibnizstr. 17, 67663 Kaiserslautern, Germany
Telefon +49 631 31657-0

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