modules: port maphide and tline

src/modules/tline.rs

@@ -0,0 +1,63 @@
+//! tline — `TLINE <mask>`, an oper command that reports how many currently-connected
+//! local users a would-be K/G/Z-line mask matches, so you can gauge the blast radius
+//! before actually setting the ban.
+//!
+//! Behaviour reference: InspIRCd's `m_tline`. Original native Rust.
+
+use crate::channels::glob_match;
+use crate::command::{CmdResult, Command};
+use crate::numeric::ERR_NOPRIVILEGES;
+use crate::server::Server;
+use crate::Uid;
+
+pub fn commands() -> Vec<Box<dyn Command>> {
+    vec![Box::new(TLine)]
+}
+
+struct TLine;
+impl Command for TLine {
+    fn name(&self) -> &'static str {
+        "TLINE"
+    }
+    fn min_params(&self) -> usize {
+        1
+    }
+    fn handle(&self, s: &mut Server, uid: Uid, params: &[String]) -> CmdResult {
+        if !s.is_oper(uid) {
+            s.numeric(
+                uid,
+                ERR_NOPRIVILEGES,
+                ":Permission Denied- You're not an IRC operator",
+            );
+            return CmdResult::Fail;
+        }
+        let mask = &params[0];
+        let total = s.users.len();
+        let matched = s
+            .users
+            .values()
+            .filter(|u| {
+                let forms = [
+                    format!("{}!{}@{}", u.nick, u.ident, u.host_display()),
+                    format!("{}@{}", u.ident, u.host),
+                    format!("{}@{}", u.ident, u.addr.ip()),
+                ];
+                forms.iter().any(|f| glob_match(mask, f))
+            })
+            .count();
+        let pct = (matched * 100).checked_div(total).unwrap_or(0);
+        let nick = s
+            .users
+            .get(&uid)
+            .map(|u| u.nick.clone())
+            .unwrap_or_default();
+        s.send(
+            uid,
+            format!(
+                ":{} NOTICE {nick} :*** TLINE: {mask} matches {matched} of {total} local users ({pct}%)",
+                s.name
+            ),
+        );
+        CmdResult::Ok
+    }
+}