modules: port randquote, disable, restrictchans, channames

src/modules/channames.rs

@@ -0,0 +1,33 @@
+//! channames — restrict which characters may appear in *new* channel names, beyond
+//! the protocol minimum. `channames_deny = <chars>` lists forbidden characters (e.g.
+//! control codes or fancy Unicode an admin doesn't want in channel names). Existing
+//! channels are unaffected. Off unless `channames_deny` is set. Dispatched from
+//! `Server::join`.
+//!
+//! Behaviour reference: InspIRCd's `m_channames`. Original native Rust.
+
+use crate::numeric::ERR_BADCHANNEL;
+use crate::server::Server;
+use crate::Uid;
+
+/// Called from `Server::join`. Returns true when `name` uses a forbidden character
+/// (the caller returns without joining). Only creation of new channels is checked.
+pub fn intercept(s: &mut Server, uid: Uid, name: &str) -> bool {
+    let Some(deny) = s.conf("channames_deny").filter(|d| !d.is_empty()) else {
+        return false;
+    };
+    let deny: Vec<char> = deny.chars().collect();
+    // joining an existing channel is always allowed
+    if s.channels.contains_key(&name.to_ascii_lowercase()) {
+        return false;
+    }
+    if name.chars().any(|c| deny.contains(&c)) {
+        s.numeric(
+            uid,
+            ERR_BADCHANNEL,
+            &format!("{name} :Channel name contains characters not permitted here"),
+        );
+        return true;
+    }
+    false
+}