Add public Android APK download

backend/.env.example

@@ -18,3 +18,4 @@ MAIL_USER=
 MAIL_PASS=
 MAIL_FROM=noreply@linkedsign.local
 FRONTEND_URL=http://localhost:5173
+ANDROID_APK_PATH=

backend/src/config/env.js

@@ -40,6 +40,8 @@ const env = {
   },
 
   frontendUrl: process.env.FRONTEND_URL || 'http://localhost:5173',
+  androidApkPath:
+    process.env.ANDROID_APK_PATH || path.resolve(process.cwd(), '..', 'android', 'apk', 'LinkedSign-debug.apk'),
 };
 
 module.exports = env;

backend/src/modules/downloads/downloads.controller.js

@@ -0,0 +1,14 @@
+const downloadsService = require('./downloads.service');
+
+const downloadAndroidApk = async (req, res, next) => {
+  try {
+    const { filePath, fileName } = await downloadsService.getAndroidApk();
+    return res.download(filePath, fileName);
+  } catch (error) {
+    return next(error);
+  }
+};
+
+module.exports = {
+  downloadAndroidApk,
+};

backend/src/modules/downloads/downloads.routes.js

@@ -0,0 +1,8 @@
+const express = require('express');
+const downloadsController = require('./downloads.controller');
+
+const router = express.Router();
+
+router.get('/android-apk', downloadsController.downloadAndroidApk);
+
+module.exports = router;

backend/src/modules/downloads/downloads.service.js

@@ -0,0 +1,24 @@
+const fs = require('fs/promises');
+const path = require('path');
+const env = require('../../config/env');
+
+const getAndroidApk = async () => {
+  const filePath = env.androidApkPath;
+
+  try {
+    await fs.access(filePath);
+  } catch {
+    const error = new Error('Android APK not found.');
+    error.statusCode = 404;
+    throw error;
+  }
+
+  return {
+    filePath,
+    fileName: path.basename(filePath),
+  };
+};
+
+module.exports = {
+  getAndroidApk,
+};

backend/src/routes/index.js

@@ -1,6 +1,7 @@
 const express = require('express');
 const authRoutes = require('../modules/auth/auth.routes');
 const certificatesRoutes = require('../modules/certificates/certificates.routes');
+const downloadsRoutes = require('../modules/downloads/downloads.routes');
 const documentsRoutes = require('../modules/documents/documents.routes');
 const signaturesRoutes = require('../modules/signatures/signatures.routes');
 const usersRoutes = require('../modules/users/users.routes');
@@ -10,6 +11,7 @@ const router = express.Router();
 
 router.use('/auth', authRoutes);
 router.use('/certificates', certificatesRoutes);
+router.use('/downloads', downloadsRoutes);
 router.use('/documents', documentsRoutes);
 router.use('/signatures', signaturesRoutes);
 router.use('/users', usersRoutes);

frontend/src/index.css

@@ -391,6 +391,9 @@ select {
 .auth-link { text-align: center; margin-top: 20px; font-size: 13px; color: var(--gray-500); }
 .auth-link a { color: var(--primary); font-weight: 600; text-decoration: none; }
 .auth-link a:hover { text-decoration: underline; }
+.auth-download-btn {
+  justify-content: center;
+}
 
 /* ─── Form fields ────────────────────────────────────────────── */
 .field { display: flex; flex-direction: column; gap: 5px; }

frontend/src/pages/auth/LoginPage.jsx

@@ -9,6 +9,8 @@ export default function LoginPage() {
   const navigate = useNavigate();
   const [form, setForm] = useState({ email: '', password: '' });
   const [loading, setLoading] = useState(false);
+  const apiBaseUrl = (import.meta.env.VITE_API_URL || 'http://localhost:4000').replace(/\/$/, '');
+  const androidApkUrl = `${apiBaseUrl}/downloads/android-apk`;
 
   const handleChange = (e) => setForm((f) => ({ ...f, [e.target.name]: e.target.value }));
 
@@ -54,6 +56,9 @@ export default function LoginPage() {
           <button type="submit" className="btn btn-primary btn-full" disabled={loading}>
             {loading ? 'Ingresando...' : 'Iniciar sesión'}
           </button>
+          <a className="btn btn-secondary btn-full auth-download-btn" href={androidApkUrl}>
+            Descargar app Android
+          </a>
         </form>
         <p className="auth-link">
           ¿No tienes cuenta? <Link to="/register">Registrarse</Link>