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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.

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summary: 'Block outgoing stanzas from users'
...

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

This module blocks all outgoing stanzas from a list of users.

Using
=====

Add mod_block_outgoing to the enabled modules in your config file:
``` {.lua}
modules_enabled = {
	-- ...
		"block_outgoing",
	-- ...
}
```

Either in a section for a certain host or the global section define which users and what stanzas to block:
``` {.lua}
block_outgoing_users = { "romeo@example.com", "juliet@example.com" }
block_outgoing_stanzas = { "message", "iq", "presence" }
```

block_outgoing_stanzas defaults to "message" if not specified.