Initial commit

utils/pushService.js

@@ -0,0 +1,75 @@
+// utils/pushService.js
+const webpush = require('web-push');
+const db = require('../db');
+
+const hasVapid =
+  !!process.env.VAPID_PUBLIC_KEY && !!process.env.VAPID_PRIVATE_KEY;
+
+if (!hasVapid) {
+  console.warn('[Push] VAPID keys não definidas. Push desativado.');
+} else {
+  webpush.setVapidDetails(
+    process.env.VAPID_SUBJECT || 'mailto:admin@evstation.local',
+    process.env.VAPID_PUBLIC_KEY,
+    process.env.VAPID_PRIVATE_KEY
+  );
+}
+
+// retry simples p/ 429 e 5xx
+async function sendWithRetry(subscription, message, tries = 2) {
+  try {
+    return await webpush.sendNotification(subscription, message);
+  } catch (err) {
+    const code = err?.statusCode;
+    if ((code === 429 || code >= 500) && tries > 1) {
+      await new Promise((r) => setTimeout(r, 1000));
+      return sendWithRetry(subscription, message, tries - 1);
+    }
+    throw err;
+  }
+}
+
+async function sendPushToUser(userId, payload) {
+  if (!hasVapid) return;
+
+  const subs = await db('push_subscriptions')
+    .where({ user_id: userId })
+    .select('id', 'endpoint', 'p256dh', 'auth');
+
+  if (!subs.length) return;
+
+  const message = JSON.stringify(payload);
+
+  await Promise.allSettled(
+    subs.map(async (s) => {
+      const subscription = {
+        endpoint: s.endpoint,
+        keys: {
+          p256dh: s.p256dh,
+          auth: s.auth,
+        },
+      };
+
+      try {
+        await sendWithRetry(subscription, message);
+
+        // TTL opcional (default 15min)
+        // se quiseres usar TTL do payload, descomenta e passa options no sendWithRetry
+        // await webpush.sendNotification(subscription, message, {
+        //   TTL: payload.ttl ?? 60 * 15,
+        // });
+      } catch (err) {
+        const code = err?.statusCode;
+
+        // remove subscriptions mortas
+        if (code === 404 || code === 410) {
+          await db('push_subscriptions').where({ id: s.id }).del();
+        } else {
+          console.error('[Push] erro ao enviar:', err.message);
+        }
+      }
+    })
+  );
+}
+
+module.exports = { sendPushToUser };