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.

---
summary: Cache presence from remote users
...

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

This module stores a timestamp of the latest presence received from
users contacts so that the client can see who is online faster when they
sign in, and won't have to wait for remote servers to reply.

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

Just enable the module.

    modules_enabled = {
        -- more modules
        "presence_cache";
    }

Advanced configuration
======================

The size of the cache is tuneable:

    presence_cache_size = 99

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

Requires 0.10 or later