nickserv: add INFO and ALIST

INFO shows an account's registration date and (to its owner) email; ALIST
lists the channels an account founds or has access on. The UTC time
formatter moves to the db module so both services share it.

modules/nickserv/alist.rs

@@ -0,0 +1,27 @@
+use crate::engine::db::Db;
+use crate::engine::service::{Sender, ServiceCtx};
+
+// ALIST: list the channels the sender's account founds or has access on.
+pub fn handle(me: &str, from: &Sender, ctx: &mut ServiceCtx, db: &Db) {
+    let Some(account) = from.account else {
+        ctx.notice(me, from.uid, "You need to be logged in. Identify to NickServ first.");
+        return;
+    };
+    let mut rows: Vec<(String, &str)> = Vec::new();
+    for c in db.channels() {
+        if c.founder.eq_ignore_ascii_case(account) {
+            rows.push((c.name.clone(), "founder"));
+        } else if let Some(a) = c.access.iter().find(|a| a.account.eq_ignore_ascii_case(account)) {
+            rows.push((c.name.clone(), if a.level == "voice" { "voice" } else { "op" }));
+        }
+    }
+    if rows.is_empty() {
+        ctx.notice(me, from.uid, "You have access on no channels.");
+        return;
+    }
+    rows.sort_by(|a, b| a.0.cmp(&b.0));
+    ctx.notice(me, from.uid, format!("Channels you have access on ({}):", rows.len()));
+    for (chan, role) in rows {
+        ctx.notice(me, from.uid, format!("  \x02{chan}\x02 ({role})"));
+    }
+}

modules/nickserv/info.rs

@@ -0,0 +1,20 @@
+use crate::engine::db::{human_time, Db};
+use crate::engine::service::{Sender, ServiceCtx};
+
+// INFO [account]: show an account's registration details. The email is shown
+// only to the account's own owner.
+pub fn handle(me: &str, from: &Sender, args: &[&str], ctx: &mut ServiceCtx, db: &Db) {
+    let name = args.get(1).copied().unwrap_or(from.nick);
+    let Some(acct) = db.account(name) else {
+        ctx.notice(me, from.uid, format!("\x02{name}\x02 isn't registered."));
+        return;
+    };
+    ctx.notice(me, from.uid, format!("Information for \x02{}\x02:", acct.name));
+    ctx.notice(me, from.uid, format!("  Registered : {}", human_time(acct.ts)));
+    if from.account == Some(acct.name.as_str()) {
+        match &acct.email {
+            Some(email) => ctx.notice(me, from.uid, format!("  Email      : {email}")),
+            None => ctx.notice(me, from.uid, "  Email      : (none set)"),
+        }
+    }
+}

modules/nickserv/nickserv.rs

@@ -10,6 +10,10 @@ mod identify;
 mod logout;
 #[path = "cert.rs"]
 mod cert;
+#[path = "info.rs"]
+mod info;
+#[path = "alist.rs"]
+mod alist;
 
 pub struct NickServ {
     pub uid: String,
@@ -40,7 +44,9 @@ impl Service for NickServ {
             Some("IDENTIFY") | Some("ID") => identify::handle(me, from, args, ctx, db),
             Some("LOGOUT") | Some("LOGOFF") => logout::handle(me, &self.guest_nick, &mut self.guest_seq, from, ctx),
             Some("CERT") => cert::handle(me, from, args, ctx, db),
-            Some("HELP") => ctx.notice(me, from.uid, "NickServ looks after your nickname. Commands: \x02REGISTER\x02 <password> [email], \x02IDENTIFY\x02 [account] <password>, \x02LOGOUT\x02, \x02CERT\x02 ADD|DEL|LIST <password> [fingerprint]."),
+            Some("INFO") => info::handle(me, from, args, ctx, db),
+            Some("ALIST") => alist::handle(me, from, ctx, db),
+            Some("HELP") => ctx.notice(me, from.uid, "NickServ looks after your nickname. Commands: \x02REGISTER\x02 <password> [email], \x02IDENTIFY\x02 [account] <password>, \x02INFO\x02 [account], \x02ALIST\x02, \x02LOGOUT\x02, \x02CERT\x02 ADD|DEL|LIST <password> [fingerprint]."),
             Some(other) => ctx.notice(me, from.uid, format!("I don't know the command \x02{other}\x02. Try \x02HELP\x02.")),
             None => {}
         }