pairing qr

scripts/create-pairing-qr.mjs

@@ -0,0 +1,73 @@
+#!/usr/bin/env node
+/**
+ * Generate a pairing QR code for JTL-POS.
+ *
+ * Usage:
+ *   node scripts/create-pairing-qr.mjs <host-ip>
+ *   npm run qr -- 192.168.1.50
+ *
+ * Reads PORT / PAIRING_CODE from .env and the TLS cert from certs/cert.pem.
+ */
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import dotenv from 'dotenv';
+import QRCode from 'qrcode';
+
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
+dotenv.config({ path: path.join(root, '.env') });
+
+const host = process.argv[2];
+if (!host) {
+  console.error('Usage: node scripts/create-pairing-qr.mjs <host-ip>');
+  process.exit(1);
+}
+
+const port = String(process.env.PORT || '4443');
+const pin = String(process.env.PAIRING_CODE || '307018');
+const certPath = path.join(root, 'certs', 'cert.pem');
+// Compact: base64 DER only (no PEM headers / line wraps) — client can re-wrap if needed
+const cert = fs
+  .readFileSync(certPath, 'utf8')
+  .replace(/-----BEGIN CERTIFICATE-----/g, '')
+  .replace(/-----END CERTIFICATE-----/g, '')
+  .replace(/\s+/g, '');
+
+const payload = {
+  v: 1,
+  host,
+  port,
+  pin,
+  cert,
+};
+
+const content = JSON.stringify(payload);
+
+const outDir = path.join(root, 'certs');
+const pngPath = path.join(outDir, 'pairing-qr.png');
+const jsonPath = path.join(outDir, 'pairing-qr.json');
+
+const qrOpts = {
+  errorCorrectionLevel: 'L', // ~7% recovery — smallest size for the payload
+  margin: 1,
+};
+
+const qr = QRCode.create(content, qrOpts);
+// Scale by module count so fewer modules actually looks smaller (not stretched to 512)
+const modulePx = 4;
+const width = qr.modules.size * modulePx;
+
+await QRCode.toFile(pngPath, content, {
+  ...qrOpts,
+  type: 'png',
+  width,
+});
+fs.writeFileSync(jsonPath, `${JSON.stringify(payload, null, 2)}\n`);
+
+console.log(await QRCode.toString(content, { type: 'terminal', small: true, ...qrOpts }));
+console.log(content);
+console.log(`host=${host} port=${port} pin=${pin}`);
+console.log(`QR version=${qr.version} modules=${qr.modules.size} png=${width}px`);
+console.log(`Wrote ${pngPath}`);
+console.log(`Wrote ${jsonPath}`);