38 lines
1.3 KiB
Rust
38 lines
1.3 KiB
Rust
//! extbanbanlist: matching extban `b:<#channel>` catches a user if they are on
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//! `#channel`'s ban list, letting one channel borrow another's bans (e.g.
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//! `+b b:#staff` bans everyone banned in #staff).
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//!
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//! The match is deliberately non-recursive: it tests only the referenced channel's
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//! plain host-mask bans (and its plain excepts), never that channel's own extbans,
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//! so two channels referencing each other can't loop.
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use crate::channels::glob_match;
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use crate::server::Server;
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use crate::Uid;
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/// A plain host-mask ban entry (not itself an extban). An extban is `<letter>:…`,
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/// matching `normalize_ban_mask`'s rule — anything else is a plain host-mask.
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fn is_plain(mask: &str) -> bool {
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let b = mask.as_bytes();
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!(b.len() >= 2 && b[0].is_ascii_alphabetic() && b[1] == b':')
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}
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/// True if `uid` is on `chan`'s (plain) ban list with no matching plain exception.
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pub fn matches(s: &Server, uid: Uid, chan: &str) -> bool {
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let Some(who) = s.users.get(&uid).map(|u| u.prefix()) else {
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return false;
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};
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let Some(ch) = s.channels.get(&chan.to_ascii_lowercase()) else {
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return false;
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};
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if ch
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.excepts
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.iter()
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.any(|e| is_plain(&e.mask) && glob_match(&e.mask, &who))
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{
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return false;
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}
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ch.bans
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.iter()
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.any(|b| is_plain(&b.mask) && glob_match(&b.mask, &who))
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}
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