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mod_cloud_notify_encrypted: Ensure body substring remains valid UTF-8 The `body:sub()` call risks splitting the string in the middle of a multi-byte UTF-8 sequence. This should have been caught by util.stanza validation, but that would have caused some havoc, at the very least causing the notification to not be sent. There have been no reports of this happening. Likely because this module isn't widely deployed among users with languages that use many longer UTF-8 sequences. The util.encodings.utf8.valid() function is O(n) where only the last sequence really needs to be checked, but it's in C and expected to be fast.
author Kim Alvefur <zash@zash.se>
date Sun, 22 Aug 2021 13:22:59 +0200
parents 79b9bd84b91c
children
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---
labels:
- 'Stage-Beta'
summary: Limit presence stanzas to save traffic
...

Introduction
============

For most people 'presence' (status changes) of contacts make up most of
the traffic received by their client. However much of the time it is not
essential to have highly accurate presence information.

This module automatically cuts down on presence traffic when clients
indicate they are inactive (using the [CSI protocol](mod_csi.html)).

This is extremely valuable for mobile clients that wish to save battery
power while in the background.

Configuration
=============

Just load the module (e.g. in modules\_enabled). There are no
configuration options.

Compatibility
=============

  ----- -------
  0.9   Works
  ----- -------