modules: port ircv3_extended_isupport (draft/extended-isupport cap + ISUPPORT command, draft/isupport batch)

src/modules/extended_isupport.rs

@@ -0,0 +1,49 @@
+//! extended_isupport — the `draft/extended-isupport` capability. reverse's own
+//! module. Normally ISUPPORT (005) is a one-shot at registration; with this cap a
+//! client can send the `ISUPPORT` command any time to re-request the current tokens
+//! (handy after a rehash changes them). If the client also has `batch`, the reply
+//! is wrapped in a `draft/isupport` BATCH so the multi-line set arrives atomically —
+//! the emission itself lives in `Server::send_isupport`, shared with the welcome burst.
+//!
+//! Behaviour reference: reverse's InspIRCd `m_ircv3_extended_isupport`. Original native Rust.
+
+use crate::command::{CmdResult, Command};
+use crate::numeric::ERR_UNKNOWNCOMMAND;
+use crate::server::Server;
+use crate::Uid;
+
+pub fn commands() -> Vec<Box<dyn Command>> {
+    vec![Box::new(ISupportCmd)]
+}
+
+/// ISUPPORT — re-send the server's ISUPPORT tokens. Requires the
+/// `draft/extended-isupport` cap; usable before registration completes.
+struct ISupportCmd;
+impl Command for ISupportCmd {
+    fn name(&self) -> &'static str {
+        "ISUPPORT"
+    }
+    fn min_params(&self) -> usize {
+        0
+    }
+    fn before_reg(&self) -> bool {
+        true
+    }
+    fn handle(&self, s: &mut Server, uid: Uid, _params: &[String]) -> CmdResult {
+        let (has_cap, has_batch) = s
+            .users
+            .get(&uid)
+            .map(|u| (u.caps.ext_isupport, u.caps.batch))
+            .unwrap_or((false, false));
+        if !has_cap {
+            s.numeric(
+                uid,
+                ERR_UNKNOWNCOMMAND,
+                "ISUPPORT :You must request the draft/extended-isupport capability to use this command",
+            );
+            return CmdResult::Fail;
+        }
+        s.send_isupport(uid, has_batch);
+        CmdResult::Ok
+    }
+}