ChanServ: add SET URL channel homepage

Founders can attach a homepage URL to a channel; it shows in INFO and
clears when set empty, mirroring SET DESC. Local-scope (channel metadata),
not gossiped, consistent with the entrymsg/description events.

src/engine/db/channel.rs

@@ -11,7 +11,7 @@ impl Db {
         self.log
             .append(Event::ChannelRegistered { name: name.to_string(), founder: founder.to_string(), ts })
             .map_err(|_| ChanError::Internal)?;
-        self.channels.insert(k, ChannelInfo { name: name.to_string(), founder: founder.to_string(), ts, lock_on: String::new(), lock_off: String::new(), access: Vec::new(), akick: Vec::new(), successor: None, desc: String::new(), entrymsg: String::new(), settings: ChanSettings::default(), topic: String::new(), suspension: None, assigned_bot: None , kickers: KickerSettings::default() , badwords: Vec::new(), badwords_rev: 0 , triggers: Vec::new(), triggers_rev: 0, last_used: ts, noexpire: false, expiry_warned: false, oper_note: None });
+        self.channels.insert(k, ChannelInfo { name: name.to_string(), founder: founder.to_string(), ts, lock_on: String::new(), lock_off: String::new(), access: Vec::new(), akick: Vec::new(), successor: None, desc: String::new(), entrymsg: String::new(), url: String::new(), settings: ChanSettings::default(), topic: String::new(), suspension: None, assigned_bot: None , kickers: KickerSettings::default() , badwords: Vec::new(), badwords_rev: 0 , triggers: Vec::new(), triggers_rev: 0, last_used: ts, noexpire: false, expiry_warned: false, oper_note: None });
         Ok(())
     }
 
@@ -187,6 +187,18 @@ impl Db {
         Ok(())
     }
 
+    pub fn set_url(&mut self, channel: &str, url: &str) -> Result<(), ChanError> {
+        let k = key(channel);
+        if !self.channels.contains_key(&k) {
+            return Err(ChanError::NoChannel);
+        }
+        self.log
+            .append(Event::ChannelUrlSet { channel: channel.to_string(), url: url.to_string() })
+            .map_err(|_| ChanError::Internal)?;
+        self.channels.get_mut(&k).unwrap().url = url.to_string();
+        Ok(())
+    }
+
     /// Turn one ChanServ SET option on or off for a channel.
     pub fn set_channel_setting(&mut self, channel: &str, setting: ChanSetting, on: bool) -> Result<(), ChanError> {
         let k = key(channel);

src/engine/db/event.rs

@@ -48,6 +48,7 @@ pub enum Event {
     ChannelSuccessorSet { channel: String, successor: Option<String> },
     ChannelDescSet { channel: String, desc: String },
     ChannelEntryMsgSet { channel: String, msg: String },
+    ChannelUrlSet { channel: String, url: String },
     ChannelSettingsSet { channel: String, settings: ChanSettings },
     ChannelKickerSet { channel: String, kickers: KickerSettings },
     ChannelBadwordsSet { channel: String, badwords: Vec<String> },
@@ -208,6 +209,7 @@ impl Event {
             | Event::ChannelSuccessorSet { .. }
             | Event::ChannelDescSet { .. }
             | Event::ChannelEntryMsgSet { .. }
+            | Event::ChannelUrlSet { .. }
             | Event::ChannelSettingsSet { .. }
             | Event::ChannelKickerSet { .. }
             | Event::ChannelBadwordsSet { .. }
@@ -393,7 +395,7 @@ pub(crate) fn apply(accounts: &mut HashMap<String, Account>, channels: &mut Hash
             grouped.remove(&key(&nick));
         }
         Event::ChannelRegistered { name, founder, ts } => {
-            channels.insert(key(&name), ChannelInfo { name, founder, ts, lock_on: String::new(), lock_off: String::new(), access: Vec::new(), akick: Vec::new(), successor: None, desc: String::new(), entrymsg: String::new(), settings: ChanSettings::default(), topic: String::new(), suspension: None, assigned_bot: None , kickers: KickerSettings::default() , badwords: Vec::new(), badwords_rev: 0 , triggers: Vec::new(), triggers_rev: 0, last_used: ts, noexpire: false, expiry_warned: false, oper_note: None });
+            channels.insert(key(&name), ChannelInfo { name, founder, ts, lock_on: String::new(), lock_off: String::new(), access: Vec::new(), akick: Vec::new(), successor: None, desc: String::new(), entrymsg: String::new(), url: String::new(), settings: ChanSettings::default(), topic: String::new(), suspension: None, assigned_bot: None , kickers: KickerSettings::default() , badwords: Vec::new(), badwords_rev: 0 , triggers: Vec::new(), triggers_rev: 0, last_used: ts, noexpire: false, expiry_warned: false, oper_note: None });
         }
         Event::ChannelDropped { name } => {
             channels.remove(&key(&name));
@@ -441,6 +443,11 @@ pub(crate) fn apply(accounts: &mut HashMap<String, Account>, channels: &mut Hash
                 c.desc = desc;
             }
         }
+        Event::ChannelUrlSet { channel, url } => {
+            if let Some(c) = channels.get_mut(&key(&channel)) {
+                c.url = url;
+            }
+        }
         Event::ChannelSettingsSet { channel, settings } => {
             if let Some(c) = channels.get_mut(&key(&channel)) {
                 c.settings = settings;

src/engine/db/mod.rs

@@ -419,6 +419,9 @@ pub struct ChannelInfo {
     // Message noticed to users as they join.
     #[serde(default)]
     pub entrymsg: String,
+    // Channel homepage URL, shown in INFO (empty = none).
+    #[serde(default)]
+    pub url: String,
     // On/off options set via ChanServ SET.
     #[serde(default)]
     pub settings: ChanSettings,

src/engine/db/store.rs

@@ -374,6 +374,9 @@ impl Store for Db {
     fn set_desc(&mut self, channel: &str, desc: &str) -> Result<(), ChanError> {
         Db::set_desc(self, channel, desc)
     }
+    fn set_url(&mut self, channel: &str, url: &str) -> Result<(), ChanError> {
+        Db::set_url(self, channel, url)
+    }
     fn set_channel_setting(&mut self, channel: &str, setting: ChanSetting, on: bool) -> Result<(), ChanError> {
         Db::set_channel_setting(self, channel, setting, on)
     }
@@ -555,6 +558,7 @@ fn channel_view(c: &ChannelInfo) -> ChannelView {
         akick: c.akick.iter().map(|k| ChanAkickView { mask: k.mask.clone(), reason: k.reason.clone() }).collect(),
         desc: c.desc.clone(),
         entrymsg: c.entrymsg.clone(),
+        url: c.url.clone(),
         signkick: c.settings.signkick,
         private: c.settings.private,
         peace: c.settings.peace,