feat: Add push notification support with VAPID keys

- Backend: web-push integration with VAPID keys
- Push subscription endpoints (GET /api/push/public-key, POST /api/push/subscribe)
- In-memory subscription store
- Frontend: Auto-subscribe to push after notification permission granted
- Service Worker: Push event handler
- Send push notifications when torrents complete
- Works even when browser is closed

backend/src/handlers/mod.rs

@@ -1,4 +1,5 @@
 use crate::{
+    push,
     xmlrpc::{self, RpcParam},
     AppState,
 };
@@ -673,3 +674,39 @@ pub async fn handle_timeout_error(err: BoxError) -> (StatusCode, &'static str) {
         )
     }
 }
+
+// --- PUSH NOTIFICATION HANDLERS ---
+
+/// Get VAPID public key for push subscription
+#[utoipa::path(
+    get,
+    path = "/api/push/public-key",
+    responses(
+        (status = 200, description = "VAPID public key", body = String)
+    )
+)]
+pub async fn get_push_public_key_handler() -> impl IntoResponse {
+    let public_key = push::get_vapid_public_key();
+    (StatusCode::OK, Json(serde_json::json!({ "publicKey": public_key }))).into_response()
+}
+
+/// Subscribe to push notifications
+#[utoipa::path(
+    post,
+    path = "/api/push/subscribe",
+    request_body = push::PushSubscription,
+    responses(
+        (status = 200, description = "Subscription saved"),
+        (status = 400, description = "Invalid subscription data")
+    )
+)]
+pub async fn subscribe_push_handler(
+    State(state): State<AppState>,
+    Json(subscription): Json<push::PushSubscription>,
+) -> impl IntoResponse {
+    tracing::info!("Received push subscription: {:?}", subscription);
+    
+    state.push_store.add_subscription(subscription).await;
+    
+    (StatusCode::OK, "Subscription saved").into_response()
+}

backend/src/main.rs

@@ -1,5 +1,6 @@
 mod diff;
 mod handlers;
+mod push;
 mod scgi;
 mod sse;
 mod xmlrpc;
@@ -30,6 +31,7 @@ pub struct AppState {
     pub tx: Arc<watch::Sender<Vec<Torrent>>>,
     pub event_bus: broadcast::Sender<AppEvent>,
     pub scgi_socket_path: String,
+    pub push_store: push::PushSubscriptionStore,
 }
 
 #[derive(Parser, Debug)]
@@ -61,7 +63,9 @@ struct Args {
         handlers::set_file_priority_handler,
         handlers::set_label_handler,
         handlers::get_global_limit_handler,
-        handlers::set_global_limit_handler
+        handlers::set_global_limit_handler,
+        handlers::get_push_public_key_handler,
+        handlers::subscribe_push_handler
     ),
     components(
         schemas(
@@ -74,7 +78,9 @@ struct Args {
             shared::TorrentTracker,
             shared::SetFilePriorityRequest,
             shared::SetLabelRequest,
-            shared::GlobalLimitRequest
+            shared::GlobalLimitRequest,
+            push::PushSubscription,
+            push::PushKeys
         )
     ),
     tags(
@@ -137,12 +143,14 @@ async fn main() {
         tx: tx.clone(),
         event_bus: event_bus.clone(),
         scgi_socket_path: args.socket.clone(),
+        push_store: push::PushSubscriptionStore::new(),
     };
 
     // Spawn background task to poll rTorrent
     let tx_clone = tx.clone();
     let event_bus_tx = event_bus.clone();
     let socket_path = args.socket.clone(); // Clone for background task
+    let push_store_clone = app_state.push_store.clone();
 
     tokio::spawn(async move {
         let client = xmlrpc::RtorrentClient::new(&socket_path);
@@ -193,6 +201,26 @@ async fn main() {
                         }
                         diff::DiffResult::Partial(updates) => {
                             for update in updates {
+                                // Check if this is a torrent completion notification
+                                if let AppEvent::Notification(ref notif) = update {
+                                    if notif.message.contains("tamamlandı") {
+                                        // Send push notification in background
+                                        let push_store = push_store_clone.clone();
+                                        let title = "Torrent Tamamlandı".to_string();
+                                        let body = notif.message.clone();
+                                        tokio::spawn(async move {
+                                            if let Err(e) = push::send_push_notification(
+                                                &push_store,
+                                                &title,
+                                                &body,
+                                            )
+                                            .await
+                                            {
+                                                tracing::error!("Failed to send push notification: {}", e);
+                                            }
+                                        });
+                                    }
+                                }
                                 let _ = event_bus_tx.send(update);
                             }
                         }
@@ -267,6 +295,8 @@ async fn main() {
             "/api/settings/global-limits",
             get(handlers::get_global_limit_handler).post(handlers::set_global_limit_handler),
         )
+        .route("/api/push/public-key", get(handlers::get_push_public_key_handler))
+        .route("/api/push/subscribe", post(handlers::subscribe_push_handler))
         .fallback(handlers::static_handler) // Serve static files for everything else
         .layer(TraceLayer::new_for_http())
         .layer(

backend/src/push.rs

@@ -0,0 +1,127 @@
+use serde::{Deserialize, Serialize};
+use std::sync::Arc;
+use tokio::sync::RwLock;
+use utoipa::ToSchema;
+use web_push::{
+    IsahcWebPushClient, SubscriptionInfo, VapidSignatureBuilder, WebPushClient, WebPushMessageBuilder,
+};
+
+// VAPID keys - PRODUCTION'DA ENVIRONMENT VARIABLE'DAN ALINMALI!
+const VAPID_PUBLIC_KEY: &str = "BEdPj6XQR7MGzM28Nev9wokF5upHoydNDahouJbQ9ZdBJpEFAN1iNfANSEvY0ItasNY5zcvvqN_tjUt64Rfd0gU";
+const VAPID_PRIVATE_KEY: &str = "aUcCYJ7kUd9UClCaWwad0IVgbYJ6svwl19MjSX7GH10";
+const VAPID_EMAIL: &str = "mailto:admin@vibetorrent.app";
+
+#[derive(Debug, Clone, Serialize, Deserialize, ToSchema)]
+pub struct PushSubscription {
+    pub endpoint: String,
+    pub keys: PushKeys,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, ToSchema)]
+pub struct PushKeys {
+    pub p256dh: String,
+    pub auth: String,
+}
+
+/// In-memory store for push subscriptions
+/// TODO: Replace with database in production
+#[derive(Default, Clone)]
+pub struct PushSubscriptionStore {
+    subscriptions: Arc<RwLock<Vec<PushSubscription>>>,
+}
+
+impl PushSubscriptionStore {
+    pub fn new() -> Self {
+        Self {
+            subscriptions: Arc::new(RwLock::new(Vec::new())),
+        }
+    }
+
+    pub async fn add_subscription(&self, subscription: PushSubscription) {
+        let mut subs = self.subscriptions.write().await;
+        
+        // Remove duplicate endpoint if exists
+        subs.retain(|s| s.endpoint != subscription.endpoint);
+        
+        subs.push(subscription);
+        tracing::info!("Added push subscription. Total: {}", subs.len());
+    }
+
+    pub async fn remove_subscription(&self, endpoint: &str) {
+        let mut subs = self.subscriptions.write().await;
+        subs.retain(|s| s.endpoint != endpoint);
+        tracing::info!("Removed push subscription. Total: {}", subs.len());
+    }
+
+    pub async fn get_all_subscriptions(&self) -> Vec<PushSubscription> {
+        self.subscriptions.read().await.clone()
+    }
+}
+
+/// Send push notification to all subscribed clients
+pub async fn send_push_notification(
+    store: &PushSubscriptionStore,
+    title: &str,
+    body: &str,
+) -> Result<(), Box<dyn std::error::Error>> {
+    let subscriptions = store.get_all_subscriptions().await;
+    
+    if subscriptions.is_empty() {
+        tracing::debug!("No push subscriptions to send to");
+        return Ok(());
+    }
+
+    tracing::info!("Sending push notification to {} subscribers", subscriptions.len());
+
+    let payload = serde_json::json!({
+        "title": title,
+        "body": body,
+        "icon": "/icon-192.png",
+        "badge": "/icon-192.png",
+        "tag": "vibetorrent"
+    });
+
+    let client = IsahcWebPushClient::new()?;
+
+    for subscription in subscriptions {
+        let subscription_info = SubscriptionInfo {
+            endpoint: subscription.endpoint.clone(),
+            keys: web_push::SubscriptionKeys {
+                p256dh: subscription.keys.p256dh.clone(),
+                auth: subscription.keys.auth.clone(),
+            },
+        };
+
+        let mut sig_builder = VapidSignatureBuilder::from_base64(
+            VAPID_PRIVATE_KEY,
+            web_push::URL_SAFE_NO_PAD,
+            &subscription_info,
+        )?;
+        
+        sig_builder.add_claim("sub", VAPID_EMAIL);
+        sig_builder.add_claim("aud", subscription.endpoint.clone());
+        let signature = sig_builder.build()?;
+
+        let mut builder = WebPushMessageBuilder::new(&subscription_info);
+        builder.set_vapid_signature(signature);
+        
+        let payload_str = payload.to_string();
+        builder.set_payload(web_push::ContentEncoding::Aes128Gcm, payload_str.as_bytes());
+
+        match client.send(builder.build()?).await {
+            Ok(_) => {
+                tracing::debug!("Push notification sent to: {}", subscription.endpoint);
+            }
+            Err(e) => {
+                tracing::error!("Failed to send push notification: {}", e);
+                // TODO: Remove invalid subscriptions
+            }
+        }
+    }
+
+    Ok(())
+}
+
+pub fn get_vapid_public_key() -> &'static str {
+    VAPID_PUBLIC_KEY
+}