# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1687644002 -7200
# Node ID d52cc18f0aa883113d203d1ebfbfbf7e1bb6641b
# Parent  f71d66bd87befec241b9d98d7d10a554f246ce3b
mod_muc_limits: Add a limit on number of bytes in a message body

diff -r f71d66bd87be -r d52cc18f0aa8 mod_muc_limits/README.markdown
--- a/mod_muc_limits/README.markdown	Sat Jun 24 23:56:13 2023 +0200
+++ b/mod_muc_limits/README.markdown	Sun Jun 25 00:00:02 2023 +0200
@@ -40,6 +40,7 @@
   muc_event_rate        0.5             The maximum number of events per second.
   muc_burst_factor      6               Allow temporary bursts of this multiple.
   muc_max_nick_length   23              The maximum allowed length of user nicknames
+  muc_max_char_count    5664            The maximum allowed number of bytes in a message
   muc_max_line_count    23              The maximum allowed number of lines in a message
 
 For more understanding of how these values are used, see the algorithm
diff -r f71d66bd87be -r d52cc18f0aa8 mod_muc_limits/mod_muc_limits.lua
--- a/mod_muc_limits/mod_muc_limits.lua	Sat Jun 24 23:56:13 2023 +0200
+++ b/mod_muc_limits/mod_muc_limits.lua	Sun Jun 25 00:00:02 2023 +0200
@@ -14,6 +14,7 @@
 
 local max_nick_length = module:get_option_number("muc_max_nick_length", 23); -- Default chosen through scientific methods
 local max_line_count = module:get_option_number("muc_max_line_count", 23); -- Default chosen through s/scientific methods/copy and paste/
+local max_char_count = module:get_option_number("muc_max_char_count", 5664); -- Default chosen by multiplying a number by 23
 
 local join_only = module:get_option_boolean("muc_limit_joins_only", false);
 local dropped_count = 0;
@@ -53,6 +54,11 @@
 	if body then
 		-- TODO calculate a text diagonal cross-section or some mathemagical
 		-- number, maybe some cost multipliers
+		if #body > max_char_count then
+			origin.send(st.error_reply(stanza, "modify", "policy-violation", "Your message is too long, please write a shorter one")
+				:up():tag("x", { xmlns = xmlns_muc }));
+			return true;
+		end
 		local body_lines = select(2, body:gsub("\n[^\n]*", ""));
 		if body_lines > max_line_count then
 			origin.send(st.error_reply(stanza, "modify", "policy-violation", "Your message is too long, please write a shorter one"):up()