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.

---
labels:
- 'Stage-Alpha'
summary: 'Support XEP-0334: Message Processing Hints for MUC messages'
...

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

This module will check for MUC messages with XEP-0334 Message
Processing Hints tags to qualify those messages as "historic"
for later MAM archiving or not.

Usage
=====

First copy the module to the prosody plugins directory.

Then add "muc\_mam\_hints" to your modules\_enabled list in your MUC
component:

``` {.lua}
Component "conference.example.org" "muc"
modules_enabled = {
  "muc_mam",
  "muc_mam_hints",
}
```