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BotServ BADWORDS: user-configurable regex kicker

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BADWORDS <#channel> ADD|DEL|LIST|CLEAR manages a channel's badword
patterns, each a regular expression, so a channel matches whatever it
wants — an improvement over Anope's fixed ANY/SINGLE/START/END. Enable
with KICK <#channel> BADWORDS ON.

Uses the regex crate: it's finite-automata based with linear-time
matching, so untrusted user patterns can't cause catastrophic
backtracking (ReDoS). A channel's patterns compile into one RegexSet
(single-pass match against all of them), cached in the engine and rebuilt
only when the list's revision changes — so the hot path is one is_match
call, no per-message compilation or allocation. Patterns are validated
(and size-limited) at add time; matching is case-insensitive by default.
This commit is contained in:
Jean Chevronnet 2026-07-13 16:16:44 +00:00
parent 43def8ee23
commit ca95184359
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9 changed files with 238 additions and 7 deletions
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5
botserv/src/lib.rs
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@ -16,6 +16,8 @@ mod say;
mod set;
#[path = "kick.rs"]
mod kick;
#[path = "badwords.rs"]
mod badwords;
// Shared gate: the sender may administer <chan>'s bot options only as its
// founder or a services admin. Notices and returns false on failure.
@ -57,7 +59,8 @@ impl Service for BotServ {
Some("ACT") => say::handle(me, from, args, ctx, net, db, true),
Some("SET") => set::handle(me, from, args, ctx, db),
Some("KICK") => kick::handle(me, from, args, ctx, db),
Some("HELP") | None => ctx.notice(me, from.uid, "BotServ keeps service bots for your channels: \x02ASSIGN\x02 <#channel> <bot> puts a bot in your channel, \x02UNASSIGN\x02 <#channel> removes it, \x02INFO\x02 <bot|#channel> shows details, \x02SAY\x02/\x02ACT\x02 <#channel> <text> speaks through the bot, \x02SET\x02 <#channel> GREET <on|off> toggles greets, \x02KICK\x02 <#channel> <type> <on|off> configures kickers. Operators also have \x02BOT\x02 ADD|DEL|LIST."),
Some("BADWORDS") => badwords::handle(me, from, args, ctx, db),
Some("HELP") | None => ctx.notice(me, from.uid, "BotServ keeps service bots for your channels: \x02ASSIGN\x02 <#channel> <bot> puts a bot in your channel, \x02UNASSIGN\x02 <#channel> removes it, \x02INFO\x02 <bot|#channel> shows details, \x02SAY\x02/\x02ACT\x02 <#channel> <text> speaks through the bot, \x02SET\x02 <#channel> GREET <on|off> toggles greets, \x02KICK\x02 <#channel> <type> <on|off> configures kickers, \x02BADWORDS\x02 <#channel> ADD|DEL|LIST manages badword regexes. Operators also have \x02BOT\x02 ADD|DEL|LIST."),
Some(other) => ctx.notice(me, from.uid, format!("I don't know the command \x02{other}\x02. Try \x02HELP\x02.")),
}
}