Mercurial > prosody-modules
view mod_block_registrations/mod_block_registrations.lua @ 4651:8231774f5bfd
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 | 27aa58ed3e2e |
children | 368bf9b06484 |
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local st = require "util.stanza"; local nodeprep = require "util.encodings".stringprep.nodeprep; local block_users = module:get_option_set("block_registrations_users", { "admin" }); local block_patterns = module:get_option_set("block_registrations_matching", {}); local require_pattern = module:get_option_string("block_registrations_require"); function is_blocked(username) -- Check if the username is simply blocked if block_users:contains(username) then return true; end for pattern in block_patterns do if username:find(pattern) then return true; end end -- Not blocked, but check that username matches allowed pattern if require_pattern and not username:match(require_pattern) then return true; end end module:hook("user-registering", function(event) local username = event.username; if is_blocked(username) then event.allowed = false; return true; end end, 10);