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feat(pos): PWA con Service Worker + sync offline

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- Add manifest.json, sw.js with cache-first/network-first strategies
- Add sync-engine.js with IndexedDB queue for offline operations
- Add /pos/api/sync/inventory endpoint for offline inventory cache
- Add /pos/sw.js route for proper SW scope registration
- Generate PWA icons (192x192, 512x512)
- Update all 10 HTML templates with manifest link, theme-color meta,
  SW registration, and sync-engine script

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
consultoria-as
2026-04-02 07:18:01 +00:00
parent 6628f2deef
commit 32581739ad
14 changed files with 391 additions and 0 deletions
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204
pos/static/js/sync-engine.js Normal file
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// /home/Autopartes/pos/static/js/sync-engine.js
// Nexus POS — Offline sync engine using IndexedDB
(function () {
'use strict';
var DB_NAME = 'nexus_pos_offline';
var DB_VERSION = 1;
var QUEUE_STORE = 'sync_queue';
var INVENTORY_STORE = 'inventory_cache';
var db = null;
// ─── IndexedDB setup ──────────────────────────────────────────
function openDB() {
return new Promise(function (resolve, reject) {
if (db) { resolve(db); return; }
var req = indexedDB.open(DB_NAME, DB_VERSION);
req.onupgradeneeded = function (e) {
var d = e.target.result;
if (!d.objectStoreNames.contains(QUEUE_STORE)) {
d.createObjectStore(QUEUE_STORE, { keyPath: 'id', autoIncrement: true });
}
if (!d.objectStoreNames.contains(INVENTORY_STORE)) {
var inv = d.createObjectStore(INVENTORY_STORE, { keyPath: 'item_id' });
inv.createIndex('sku', 'sku', { unique: false });
inv.createIndex('name', 'name', { unique: false });
}
};
req.onsuccess = function (e) {
db = e.target.result;
resolve(db);
};
req.onerror = function () { reject(req.error); };
});
}
// ─── Queue operations for offline replay ──────────────────────
function queueOperation(url, method, body) {
return openDB().then(function (d) {
return new Promise(function (resolve, reject) {
var tx = d.transaction(QUEUE_STORE, 'readwrite');
tx.objectStore(QUEUE_STORE).add({
url: url,
method: method,
body: body || null,
timestamp: Date.now()
});
tx.oncomplete = function () { resolve(); };
tx.onerror = function () { reject(tx.error); };
});
});
}
// ─── Process queued operations ────────────────────────────────
function processQueue() {
return openDB().then(function (d) {
return new Promise(function (resolve, reject) {
var tx = d.transaction(QUEUE_STORE, 'readonly');
var req = tx.objectStore(QUEUE_STORE).getAll();
req.onsuccess = function () { resolve(req.result); };
req.onerror = function () { reject(req.error); };
});
}).then(function (ops) {
if (!ops.length) return Promise.resolve({ synced: 0 });
// Replay in order
var chain = Promise.resolve();
var synced = 0;
var failed = 0;
ops.forEach(function (op) {
chain = chain.then(function () {
var opts = { method: op.method, headers: { 'Content-Type': 'application/json' } };
if (op.body) opts.body = JSON.stringify(op.body);
return fetch(op.url, opts).then(function (resp) {
if (resp.ok) {
synced++;
return removeFromQueue(op.id);
}
failed++;
}).catch(function () {
failed++;
});
});
});
return chain.then(function () {
return { synced: synced, failed: failed, total: ops.length };
});
});
}
function removeFromQueue(id) {
return openDB().then(function (d) {
return new Promise(function (resolve, reject) {
var tx = d.transaction(QUEUE_STORE, 'readwrite');
tx.objectStore(QUEUE_STORE).delete(id);
tx.oncomplete = function () { resolve(); };
tx.onerror = function () { reject(tx.error); };
});
});
}
function getQueueCount() {
return openDB().then(function (d) {
return new Promise(function (resolve, reject) {
var tx = d.transaction(QUEUE_STORE, 'readonly');
var req = tx.objectStore(QUEUE_STORE).count();
req.onsuccess = function () { resolve(req.result); };
req.onerror = function () { reject(req.error); };
});
});
}
// ─── Inventory cache ──────────────────────────────────────────
function cacheInventory() {
return fetch('/pos/api/sync/inventory').then(function (resp) {
if (!resp.ok) throw new Error('Sync inventory failed: ' + resp.status);
return resp.json();
}).then(function (data) {
var items = data.items || [];
return openDB().then(function (d) {
return new Promise(function (resolve, reject) {
var tx = d.transaction(INVENTORY_STORE, 'readwrite');
var store = tx.objectStore(INVENTORY_STORE);
store.clear();
items.forEach(function (item) { store.put(item); });
tx.oncomplete = function () { resolve(items.length); };
tx.onerror = function () { reject(tx.error); };
});
});
});
}
function getCachedInventory(query) {
return openDB().then(function (d) {
return new Promise(function (resolve, reject) {
var tx = d.transaction(INVENTORY_STORE, 'readonly');
var req = tx.objectStore(INVENTORY_STORE).getAll();
req.onsuccess = function () {
var all = req.result;
if (!query) { resolve(all); return; }
var q = query.toLowerCase();
var filtered = all.filter(function (item) {
return (item.sku && item.sku.toLowerCase().indexOf(q) !== -1) ||
(item.name && item.name.toLowerCase().indexOf(q) !== -1) ||
(item.barcode && item.barcode.toLowerCase().indexOf(q) !== -1);
});
resolve(filtered);
};
req.onerror = function () { reject(req.error); };
});
});
}
// ─── Connectivity helpers ─────────────────────────────────────
function isOnline() {
return navigator.onLine;
}
// ─── Auto-sync on reconnect ───────────────────────────────────
window.addEventListener('online', function () {
console.log('[SyncEngine] Online — processing queue...');
processQueue().then(function (result) {
if (result.synced > 0) {
console.log('[SyncEngine] Synced ' + result.synced + ' operations');
}
}).catch(function (err) {
console.error('[SyncEngine] Queue processing error:', err);
});
});
window.addEventListener('offline', function () {
console.log('[SyncEngine] Offline — operations will be queued');
});
// Listen for SW sync messages
if ('serviceWorker' in navigator) {
navigator.serviceWorker.addEventListener('message', function (event) {
if (event.data && event.data.type === 'SYNC_REQUESTED') {
processQueue();
}
});
}
// ─── Init DB on load ──────────────────────────────────────────
openDB().catch(function (err) {
console.error('[SyncEngine] Failed to open IndexedDB:', err);
});
// ─── Public API ───────────────────────────────────────────────
window.SyncEngine = {
queueOperation: queueOperation,
processQueue: processQueue,
getQueueCount: getQueueCount,
isOnline: isOnline,
cacheInventory: cacheInventory,
getCachedInventory: getCachedInventory
};
})();

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13
pos/static/pwa/manifest.json Normal file
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{
"name": "Nexus POS",
"short_name": "NexusPOS",
"description": "Sistema de Punto de Venta para Refaccionarias",
"start_url": "/pos/login",
"display": "standalone",
"background_color": "#0d0d0d",
"theme_color": "#F5A623",
"icons": [
{"src": "/pos/static/pwa/icon-192.png", "sizes": "192x192", "type": "image/png"},
{"src": "/pos/static/pwa/icon-512.png", "sizes": "512x512", "type": "image/png"}
]
}

134
pos/static/pwa/sw.js Normal file
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// /home/Autopartes/pos/static/pwa/sw.js
// Nexus POS — Service Worker v1
const CACHE_NAME = 'nexus-pos-v1';
const APP_SHELL = [
'/pos/login',
'/pos/sale',
'/pos/catalog',
'/pos/inventory',
'/pos/customers',
'/pos/invoicing',
'/pos/accounting',
'/pos/dashboard',
'/pos/config',
'/pos/reports',
'/pos/static/css/tokens.css',
'/pos/static/css/common.css',
'/pos/static/js/app-init.js',
'/pos/static/js/sidebar.js',
'/pos/static/js/login.js',
'/pos/static/js/pos.js',
'/pos/static/js/catalog.js',
'/pos/static/js/inventory.js',
'/pos/static/js/customers.js',
'/pos/static/js/invoicing.js',
'/pos/static/js/accounting.js',
'/pos/static/js/dashboard.js',
'/pos/static/js/config.js',
'/pos/static/js/reports.js',
'/pos/static/js/offline-banner.js',
'/pos/static/js/sync-engine.js',
'/pos/static/pwa/manifest.json',
'/pos/static/pwa/icon-192.png',
'/pos/static/pwa/icon-512.png'
];
// ─── Install: pre-cache app shell ────────────────────────────────
self.addEventListener('install', function (event) {
event.waitUntil(
caches.open(CACHE_NAME).then(function (cache) {
return cache.addAll(APP_SHELL);
}).then(function () {
return self.skipWaiting();
})
);
});
// ─── Activate: purge old caches ──────────────────────────────────
self.addEventListener('activate', function (event) {
event.waitUntil(
caches.keys().then(function (names) {
return Promise.all(
names.filter(function (n) { return n !== CACHE_NAME; })
.map(function (n) { return caches.delete(n); })
);
}).then(function () {
return self.clients.claim();
})
);
});
// ─── Fetch strategy ──────────────────────────────────────────────
self.addEventListener('fetch', function (event) {
var url = new URL(event.request.url);
// API calls → network-first
if (url.pathname.indexOf('/pos/api/') !== -1) {
event.respondWith(networkFirst(event.request));
return;
}
// Everything else → cache-first
event.respondWith(cacheFirst(event.request));
});
function cacheFirst(request) {
return caches.match(request).then(function (cached) {
if (cached) {
// Update cache in background
fetch(request).then(function (response) {
if (response && response.status === 200) {
caches.open(CACHE_NAME).then(function (cache) {
cache.put(request, response);
});
}
}).catch(function () { /* offline, ignore */ });
return cached;
}
return fetch(request).then(function (response) {
if (response && response.status === 200) {
var clone = response.clone();
caches.open(CACHE_NAME).then(function (cache) {
cache.put(request, clone);
});
}
return response;
});
});
}
function networkFirst(request) {
return fetch(request).then(function (response) {
if (response && response.status === 200) {
var clone = response.clone();
caches.open(CACHE_NAME).then(function (cache) {
cache.put(request, clone);
});
}
return response;
}).catch(function () {
return caches.match(request);
});
}
// ─── Background Sync ─────────────────────────────────────────────
self.addEventListener('sync', function (event) {
if (event.tag === 'nexus-pos-sync') {
event.respondWith && event.waitUntil(
self.clients.matchAll().then(function (clients) {
clients.forEach(function (client) {
client.postMessage({ type: 'SYNC_REQUESTED' });
});
})
);
}
});
// ─── Message handler ─────────────────────────────────────────────
self.addEventListener('message', function (event) {
if (event.data && event.data.type === 'SKIP_WAITING') {
self.skipWaiting();
}
});

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pos/templates/accounting.html
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@@ -6,6 +6,8 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Contabilidad — Nexus Autoparts POS</title>
<link rel="stylesheet" href="/pos/static/css/tokens.css" />
<link rel="manifest" href="/pos/static/pwa/manifest.json" />
<meta name="theme-color" content="#F5A623" />
<style>
/* =========================================================================
@@ -2302,6 +2304,8 @@
<script src="/pos/static/js/app-init.js"></script>
<script src="/pos/static/js/sidebar.js"></script>
<script src="/pos/static/js/accounting.js"></script>
<script src="/pos/static/js/sync-engine.js"></script>
<script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
</body>
</html>

6
pos/templates/catalog.html
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@@ -6,6 +6,9 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Catalogo — Nexus Autoparts POS</title>
<link rel="stylesheet" href="/pos/static/css/tokens.css" />
<link rel="stylesheet" href="/pos/static/css/chat.css" />
<link rel="manifest" href="/pos/static/pwa/manifest.json" />
<meta name="theme-color" content="#F5A623" />
<style>
/* =========================================================================
@@ -630,5 +633,8 @@
<script src="/pos/static/js/sidebar.js"></script>
<script src="/pos/static/js/catalog.js"></script>
<script src="/pos/static/js/offline-banner.js"></script>
<script src="/pos/static/js/chat.js"></script>
<script src="/pos/static/js/sync-engine.js"></script>
<script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
</body>
</html>

4
pos/templates/config.html
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@@ -6,6 +6,8 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Configuración — Nexus Autoparts POS</title>
<link rel="stylesheet" href="/pos/static/css/tokens.css" />
<link rel="manifest" href="/pos/static/pwa/manifest.json" />
<meta name="theme-color" content="#F5A623" />
<style>
/* =========================================================================
@@ -1824,6 +1826,8 @@
<script src="/pos/static/js/app-init.js"></script>
<script src="/pos/static/js/sidebar.js"></script>
<script src="/pos/static/js/config.js"></script>
<script src="/pos/static/js/sync-engine.js"></script>
<script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
</body>
</html>

4
pos/templates/customers.html
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@@ -6,6 +6,8 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Nexus Autoparts — Clientes</title>
<link rel="stylesheet" href="/pos/static/css/tokens.css" />
<link rel="manifest" href="/pos/static/pwa/manifest.json" />
<meta name="theme-color" content="#F5A623" />
<style>
/* =====================================================================
@@ -2149,5 +2151,7 @@
<script src="/pos/static/js/sidebar.js"></script>
<script src="/pos/static/js/customers.js"></script>
<script src="/pos/static/js/offline-banner.js"></script>
<script src="/pos/static/js/sync-engine.js"></script>
<script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
</body>
</html>

4
pos/templates/dashboard.html
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@@ -6,6 +6,8 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Nexus Autoparts — Dashboard</title>
<link rel="stylesheet" href="/pos/static/css/tokens.css" />
<link rel="manifest" href="/pos/static/pwa/manifest.json" />
<meta name="theme-color" content="#F5A623" />
<style>
/* ==========================================================================
@@ -1952,6 +1954,8 @@
<script src="/pos/static/js/app-init.js"></script>
<script src="/pos/static/js/sidebar.js"></script>
<script src="/pos/static/js/dashboard.js"></script>
<script src="/pos/static/js/sync-engine.js"></script>
<script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
</body>
</html>

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pos/templates/inventory.html
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@@ -6,6 +6,8 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Inventario — Nexus Autoparts POS</title>
<link rel="stylesheet" href="/pos/static/css/tokens.css" />
<link rel="manifest" href="/pos/static/pwa/manifest.json" />
<meta name="theme-color" content="#F5A623" />
<style>
/* =========================================================================
@@ -2527,5 +2529,7 @@
<script src="/pos/static/js/sidebar.js"></script>
<script src="/pos/static/js/inventory.js"></script>
<script src="/pos/static/js/offline-banner.js"></script>
<script src="/pos/static/js/sync-engine.js"></script>
<script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
</body>
</html>

4
pos/templates/invoicing.html
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@@ -6,6 +6,8 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Facturación CFDI — Nexus Autoparts POS</title>
<link rel="stylesheet" href="/pos/static/css/tokens.css" />
<link rel="manifest" href="/pos/static/pwa/manifest.json" />
<meta name="theme-color" content="#F5A623" />
<style>
/* =========================================================================
@@ -2724,6 +2726,8 @@
<script src="/pos/static/js/app-init.js"></script>
<script src="/pos/static/js/sidebar.js"></script>
<script src="/pos/static/js/invoicing.js"></script>
<script src="/pos/static/js/sync-engine.js"></script>
<script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
</body>
</html>

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pos/templates/pos.html
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@@ -6,6 +6,9 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Nexus Autoparts — Punto de Venta</title>
<link rel="stylesheet" href="/pos/static/css/tokens.css" />
<link rel="stylesheet" href="/pos/static/css/chat.css" />
<link rel="manifest" href="/pos/static/pwa/manifest.json" />
<meta name="theme-color" content="#F5A623" />
<style>
/* =====================================================================
@@ -1527,5 +1530,8 @@
setInterval(updateClock, 30000);
</script>
<script src="/pos/static/js/chat.js"></script>
<script src="/pos/static/js/sync-engine.js"></script>
<script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
</body>
</html>

4
pos/templates/reports.html
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@@ -6,6 +6,8 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Reportes — Nexus Autoparts POS</title>
<link rel="stylesheet" href="/pos/static/css/tokens.css" />
<link rel="manifest" href="/pos/static/pwa/manifest.json" />
<meta name="theme-color" content="#F5A623" />
<style>
/* =========================================================================
@@ -2918,6 +2920,8 @@
<script src="/pos/static/js/app-init.js"></script>
<script src="/pos/static/js/sidebar.js"></script>
<script src="/pos/static/js/reports.js"></script>
<script src="/pos/static/js/sync-engine.js"></script>
<script>if('serviceWorker' in navigator){navigator.serviceWorker.register('/pos/sw.js',{scope:'/pos/'});}</script>
</body>
</html>