Mashallah we got telegram now :o

docker-compose.yml

@@ -4,8 +4,12 @@ services:
     container_name: labdeck
     restart: unless-stopped
     ports:
-      - "8412:8787"   # put a TLS reverse proxy in front (Caddy, Traefik, Pangolin ...), change port to your liking
+      - "8787:8787"   # put a TLS reverse proxy in front (Caddy, Traefik, Pangolin ...), change port to your liking
     volumes:
-      - ./data:/data
-      # Health checks of LAN hosts work with the default bridge network.
-      # If you need to reach services bound to the Docker host itself, use network_mode: host instead.
+      - labdeck-data:/data      # named volume: Docker sets the right owner automatically
+      # Bind mount instead? Create the folder first and give it to the container user:
+      #   mkdir -p data && sudo chown 10001:10001 data
+      # - ./data:/data
+
+volumes:
+  labdeck-data:

src/alerts.rs

@@ -34,6 +34,21 @@ pub async fn send(app: &App, title: &str, body: &str, good: bool) -> Result<(),
         "slack" => client
             .post(&url)
             .json(&json!({ "text": format!("{} *{}*\n{}", if good { ":large_green_circle:" } else { ":red_circle:" }, title, body) })),
+        "telegram" => {
+            // URL: https://api.telegram.org/bot<TOKEN>/sendMessage?chat_id=<ID>
+            let mut u = reqwest::Url::parse(&url).map_err(|e| format!("invalid Telegram URL: {e}"))?;
+            let chat_id = u
+                .query_pairs()
+                .find(|(k, _)| k == "chat_id")
+                .map(|(_, v)| v.into_owned())
+                .ok_or("Telegram URL needs ?chat_id=<ID> at the end")?;
+            u.set_query(None);
+            client.post(u).json(&json!({
+                "chat_id": chat_id,
+                "text": format!("{} {}\n{}", if good { "🟢" } else { "🔴" }, title, body),
+                "disable_web_page_preview": true,
+            }))
+        }
         "ntfy" => {
             let mut r = client
                 .post(&url)
@@ -63,6 +78,9 @@ pub async fn send(app: &App, title: &str, body: &str, good: bool) -> Result<(),
     if resp.status().is_success() {
         Ok(())
     } else {
-        Err(format!("webhook answered HTTP {}", resp.status().as_u16()))
+        let code = resp.status().as_u16();
+        let body = resp.text().await.unwrap_or_default();
+        let body: String = body.chars().take(200).collect();
+        Err(format!("webhook answered HTTP {code}: {body}"))
     }
 }

src/api.rs

@@ -504,7 +504,7 @@ async fn settings_put(State(app): Ctx, Json(mut s): Json<Settings>) -> R {
     if !s.webhook_url.is_empty() && !(s.webhook_url.starts_with("http://") || s.webhook_url.starts_with("https://")) {
         return Err(bad("webhook URL must start with http:// or https://"));
     }
-    if !matches!(s.webhook_kind.as_str(), "json" | "discord" | "slack" | "ntfy") {
+    if !matches!(s.webhook_kind.as_str(), "json" | "discord" | "telegram" | "slack" | "ntfy") {
         return Err(bad("unknown webhook type"));
     }
     let c = app.db.lock().unwrap();

src/main.rs

@@ -53,7 +53,12 @@ async fn main() {
         let _ = std::fs::set_permissions(&data_dir, std::fs::Permissions::from_mode(0o700));
     }
     let db_path = format!("{}/labdeck.db", data_dir.trim_end_matches('/'));
-    let conn = db::open(&db_path).expect("cannot open database");
+    let conn = db::open(&db_path).unwrap_or_else(|e| {
+        eprintln!("cannot open database {db_path}: {e}");
+        eprintln!("hint: the data directory must be writable by this process.");
+        eprintln!("      Docker bind mount: sudo chown 10001:10001 <dir>   (or use a named volume)");
+        std::process::exit(1);
+    });
 
     let app = Arc::new(App {
         db: Mutex::new(conn),

web/app.js

@@ -850,9 +850,18 @@ async function buildSettings() {
     class: 'btn' + (currentTheme() === id ? ' primary' : ''), on: { click: () => { applyTheme(id); buildSettings(); } },
   }, h('span', { class: 'sw', style: 'background:' + c }), id)));
 
-  const kind = h('select', { id: 'wk' }, [['json', 'Generic JSON'], ['discord', 'Discord'], ['slack', 'Slack'], ['ntfy', 'ntfy']]
+  const kind = h('select', { id: 'wk' }, [['json', 'Generic JSON'], ['discord', 'Discord'], ['telegram', 'Telegram'], ['slack', 'Slack'], ['ntfy', 'ntfy']]
     .map(([v, l]) => h('option', { value: v, selected: st.webhook_kind === v }, l)));
-  const url = h('input', { type: 'text', id: 'wu', value: st.webhook_url, placeholder: 'https://ntfy.example.com/homelab', spellcheck: false });
+  const HOOK_HELP = {
+    json: ['https://example.com/hook', 'POSTs {title, message, status, time, source} as JSON.'],
+    discord: ['https://discord.com/api/webhooks/<id>/<token>', 'Discord: channel settings > Integrations > Webhooks > New Webhook > Copy Webhook URL.'],
+    telegram: ['https://api.telegram.org/bot<TOKEN>/sendMessage?chat_id=<CHAT_ID>', 'Telegram: create a bot with @BotFather for the token, send the bot a message, then find your chat id via https://api.telegram.org/bot<TOKEN>/getUpdates (result > message > chat > id). Groups have negative ids.'],
+    slack: ['https://hooks.slack.com/services/T000/B000/XXXX', 'Slack: create an Incoming Webhook app and copy its URL.'],
+    ntfy: ['https://ntfy.sh/my-homelab-alerts', 'ntfy: the full topic URL.'],
+  };
+  const url = h('input', { type: 'text', id: 'wu', value: st.webhook_url, placeholder: HOOK_HELP[st.webhook_kind]?.[0] || '', spellcheck: false });
+  const hookHelp = h('p', { class: 'dim' }, HOOK_HELP[st.webhook_kind]?.[1] || '');
+  kind.addEventListener('change', () => { url.placeholder = HOOK_HELP[kind.value][0]; hookHelp.textContent = HOOK_HELP[kind.value][1]; });
   const saveHook = async () => { await api('PUT', '/api/settings', { webhook_url: url.value, webhook_kind: kind.value }); };
 
   const snipList = h('div', null, S.snippets.length ? S.snippets.map(sn => h('div', { class: 'row' },
@@ -881,6 +890,7 @@ async function buildSettings() {
     h('section', { class: 'section' }, h('h2', null, 'Alerts'),
       h('p', null, 'Get a message when a service goes down or recovers, or when a certificate is about to expire.'),
       h('div', { class: 'row' }, h('div', { style: 'width:180px' }, kind), h('div', { class: 'grow' }, url)),
+      hookHelp,
       h('div', { class: 'row' },
         h('button', { class: 'btn primary', on: { click: async () => { try { await saveHook(); toast('Alert settings saved.'); } catch (e) { fail(e); } } } }, 'Save'),
         h('button', { class: 'btn', on: { click: async () => { try { await saveHook(); await api('POST', '/api/settings/test-webhook'); toast('Test message sent.'); } catch (e) { fail(e); } } } }, 'Send test message'))),