modules: port randquote, disable, restrictchans, channames

src/modules/randquote.rs

@@ -0,0 +1,44 @@
+//! randquote — greet each connecting user with a random line from a configured
+//! set of quotes. Off unless one or more `randquote = <line>` are configured.
+//!
+//! Behaviour reference: InspIRCd's `m_randquote`. Original native Rust.
+
+use openssl::rand::rand_bytes;
+
+use crate::module::Module;
+use crate::server::Server;
+use crate::Uid;
+
+/// A random index in `0..n` from the CSPRNG (0 if `n == 0` or on error).
+fn rand_below(n: usize) -> usize {
+    if n == 0 {
+        return 0;
+    }
+    let mut b = [0u8; 8];
+    if rand_bytes(&mut b).is_err() {
+        return 0;
+    }
+    (u64::from_le_bytes(b) % n as u64) as usize
+}
+
+pub struct RandQuote;
+
+impl Module for RandQuote {
+    fn name(&self) -> &'static str {
+        "randquote"
+    }
+
+    fn on_user_connect(&mut self, srv: &mut Server, uid: Uid) {
+        let quotes = srv.conf_all("randquote");
+        if quotes.is_empty() {
+            return;
+        }
+        let quote = quotes[rand_below(quotes.len())].clone();
+        let nick = srv
+            .users
+            .get(&uid)
+            .map(|u| u.nick.clone())
+            .unwrap_or_default();
+        srv.send(uid, format!(":{} NOTICE {nick} :{quote}", srv.name));
+    }
+}