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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 3a96070f4a14
children 67848bf6b425
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# Introduction

This module implements [XEP-0425: Message Moderation].

# Usage

Moderation is done via a supporting client and requires a `moderator`
role in the channel / group chat.

# Configuration

Example [MUC component][doc:chatrooms] configuration:

``` {.lua}
VirtualHost "channels.example.com" "muc"
modules_enabled = {
    "muc_mam",
    "muc_moderation",
}
```

# Compatibility

-   Should work with Prosody 0.11.x and later.
-   Tested with trunk rev `52c6dfa04dba`.
-   Message tombstones requires a compatible storage module implementing
    a new message replacement API.

## Clients

-   Tested with [Converse.js](https://conversejs.org/)
    [v6.0.1](https://github.com/conversejs/converse.js/releases/tag/v6.0.1)