view mod_mam/README.markdown @ 2017:d44ac0756c46

mod_mam: Enable archiving by default, less of a privacy issue if messages expire
author Kim Alvefur <>
date Tue, 19 Jan 2016 13:34:53 +0100
parents 279885fd9728
children 77b9c7e5fd63
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- 'Stage-Beta'
summary: 'XEP-0313: Message Archive Management'


Implementation of [XEP-0313: Message Archive Management].


This module will archive all messages that match the simple rules setup
by the user, and allow the user to access this archive.


First copy the module to the prosody plugins directory.

Then add "mam" to your modules\_enabled list:

``` {.lua}
modules_enabled = {
    -- ...
    -- ...


Option summary

  option                         type                    default
  ------------------------------ ----------------------- ---------
  max\_archive\_query\_results   number                  `50`
  default\_archive\_policy       boolean or `"roster"`   `true`
  archive\_expires\_after        string                  `"1w"`

Storage backend

mod\_mam uses the store "archive2"[^1]. See [Prosodys data storage
documentation][doc:storage] for information on how to configure storage.

For example, to use mod\_storage\_sql (requires Prosody 0.10 or later):

``` {.lua}
storage = {
  archive2 = "sql";

Query size limits

    max_archive_query_results = 20;

This is the largest number of messages that are allowed to be retrieved
in one request *page*. A query that does not fit in one page will
include a reference to the next page, letting clients page through the
result set. Setting large number is not recomended, as Prosody will be
blocked while processing the request and will not be able to do anything

Archive expiry

Messages in the archive will expire after some time, by default one
week. This can be changed by setting `archive_expires_after`:

``` {.lua}
archive_expires_after = "1d" -- one day

archive_expires_after = "1w" -- one week, the default

archive_expires_after = "2m" -- two months

archive_expires_after = "1y" -- one year

archive_expires_after = 60 * 60 -- one hour

archive_expires_after = "never" -- forever

The format is an integer number of seconds or a multiple of a period
given by a suffix that can be one of `d` (day), `w` (week), `m` (month)
or `y` (year). No multiplier means seconds.

Message matching policy

The MAM protocol includes a way for clients to control what messages
should be stored. This allows users to enable or disable archiving by
default or for specific contacts.

``` {.lua}
default_archive_policy = true

  `default_archive_policy =`   Meaning
  ---------------------------- ------------------------------------------------------
  `false`                      Store no messages. This is the default.
  `"roster"`                   Store messages to/from contacts in the users roster.
  `true`                       Store all messages.


  ------- ---------------
  trunk   Works
  0.10    Works [^2]
  0.9     Unsupported
  0.8     Does not work
  ------- ---------------

[^1]: Might be changed to "mam" at some point

[^2]: requires a storage driver with archive support, eg
    mod\_storage\_sql in 0.10