ChanServ: add SET EMAIL channel contact address

Founders can attach a contact email to a channel, shown in INFO and
cleared when set empty. Mirrors SET URL exactly; Local-scope channel
metadata. Completes the channel DESC/URL/EMAIL trio.

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(), 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 });
+        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(), email: 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(())
     }
 
@@ -199,6 +199,18 @@ impl Db {
         Ok(())
     }
 
+    pub fn set_channel_email(&mut self, channel: &str, email: &str) -> Result<(), ChanError> {
+        let k = key(channel);
+        if !self.channels.contains_key(&k) {
+            return Err(ChanError::NoChannel);
+        }
+        self.log
+            .append(Event::ChannelEmailSet { channel: channel.to_string(), email: email.to_string() })
+            .map_err(|_| ChanError::Internal)?;
+        self.channels.get_mut(&k).unwrap().email = email.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

@@ -49,6 +49,7 @@ pub enum Event {
     ChannelDescSet { channel: String, desc: String },
     ChannelEntryMsgSet { channel: String, msg: String },
     ChannelUrlSet { channel: String, url: String },
+    ChannelEmailSet { channel: String, email: String },
     ChannelSettingsSet { channel: String, settings: ChanSettings },
     ChannelKickerSet { channel: String, kickers: KickerSettings },
     ChannelBadwordsSet { channel: String, badwords: Vec<String> },
@@ -210,6 +211,7 @@ impl Event {
             | Event::ChannelDescSet { .. }
             | Event::ChannelEntryMsgSet { .. }
             | Event::ChannelUrlSet { .. }
+            | Event::ChannelEmailSet { .. }
             | Event::ChannelSettingsSet { .. }
             | Event::ChannelKickerSet { .. }
             | Event::ChannelBadwordsSet { .. }
@@ -395,7 +397,7 @@ 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(), 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 });
+            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(), email: 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));
@@ -448,6 +450,11 @@ pub(crate) fn apply(accounts: &mut HashMap<String, Account>, channels: &mut Hash
                 c.url = url;
             }
         }
+        Event::ChannelEmailSet { channel, email } => {
+            if let Some(c) = channels.get_mut(&key(&channel)) {
+                c.email = email;
+            }
+        }
         Event::ChannelSettingsSet { channel, settings } => {
             if let Some(c) = channels.get_mut(&key(&channel)) {
                 c.settings = settings;

src/engine/db/mod.rs

@@ -422,6 +422,9 @@ pub struct ChannelInfo {
     // Channel homepage URL, shown in INFO (empty = none).
     #[serde(default)]
     pub url: String,
+    // Channel contact email, shown in INFO (empty = none).
+    #[serde(default)]
+    pub email: String,
     // On/off options set via ChanServ SET.
     #[serde(default)]
     pub settings: ChanSettings,

src/engine/db/store.rs

@@ -377,6 +377,9 @@ impl Store for Db {
     fn set_url(&mut self, channel: &str, url: &str) -> Result<(), ChanError> {
         Db::set_url(self, channel, url)
     }
+    fn set_channel_email(&mut self, channel: &str, email: &str) -> Result<(), ChanError> {
+        Db::set_channel_email(self, channel, email)
+    }
     fn set_channel_setting(&mut self, channel: &str, setting: ChanSetting, on: bool) -> Result<(), ChanError> {
         Db::set_channel_setting(self, channel, setting, on)
     }
@@ -559,6 +562,7 @@ fn channel_view(c: &ChannelInfo) -> ChannelView {
         desc: c.desc.clone(),
         entrymsg: c.entrymsg.clone(),
         url: c.url.clone(),
+        email: c.email.clone(),
         signkick: c.settings.signkick,
         private: c.settings.private,
         peace: c.settings.peace,