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docker-server/server.js

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+import express from 'express';
+import cors from 'cors';
+import path from 'path';
+import fs from 'fs';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const app = express();
+const port = process.env.PORT || 3001;
+
+// Middlewares
+app.use(cors());
+app.use(express.json({ limit: '50mb' }));
+
+// Data Directory for JSON files
+const dataDir = path.resolve(__dirname, 'data');
+if (!fs.existsSync(dataDir)) {
+  fs.mkdirSync(dataDir, { recursive: true });
+}
+
+// =======================
+// API Routes
+// =======================
+
+// Mock PPT APIs (Windows GUI features are not supported on Linux/Docker)
+app.get('/api/ppt/check', (req, res) => {
+  res.json({ success: true, hasPpt: false, ppts: [] });
+});
+
+app.post('/api/ppt/control', (req, res) => {
+  res.json({ success: false, error: 'Not supported on server environment' });
+});
+
+// Local File Storage APIs
+app.post('/api/local-file/save', (req, res) => {
+  try {
+    const { key, data } = req.body;
+    if (!key || !data) throw new Error('Missing key or data');
+    
+    // Sanitize key
+    const safeKey = String(key).replace(/[^a-zA-Z0-9_-]/g, '_');
+    const filePath = path.join(dataDir, `${safeKey}.json`);
+    
+    fs.writeFileSync(filePath, JSON.stringify(data, null, 2));
+    res.json({ success: true });
+  } catch (e) {
+    res.status(500).json({ success: false, error: e.message });
+  }
+});
+
+app.get('/api/local-file/load', (req, res) => {
+  try {
+    const key = req.query.key;
+    if (!key) {
+      return res.status(400).json({ success: false, error: 'Missing key' });
+    }
+    
+    const safeKey = String(key).replace(/[^a-zA-Z0-9_-]/g, '_');
+    const filePath = path.join(dataDir, `${safeKey}.json`);
+    
+    if (fs.existsSync(filePath)) {
+      const data = fs.readFileSync(filePath, 'utf-8');
+      res.json({ success: true, data: JSON.parse(data) });
+    } else {
+      res.status(404).json({ success: false, error: 'Not found' });
+    }
+  } catch (e) {
+    res.status(500).json({ success: false, error: e.message });
+  }
+});
+
+app.get('/api/local-file/keys', (req, res) => {
+  try {
+    const files = fs.readdirSync(dataDir);
+    const keys = files
+      .filter(f => f.endsWith('.json'))
+      .map(f => f.replace('.json', ''));
+    res.json({ success: true, keys });
+  } catch (e) {
+    res.status(500).json({ success: false, error: e.message });
+  }
+});
+
+// =======================
+// Static Files & SPA
+// =======================
+const staticDir = path.resolve(__dirname, 'dist');
+
+if (fs.existsSync(staticDir)) {
+  // Serve static files
+  app.use(express.static(staticDir, {
+    setHeaders: (res, path, stat) => {
+      // Prevent caching for sw.js and index.html
+      if (path.endsWith('sw.js') || path.endsWith('index.html')) {
+        res.setHeader('Cache-Control', 'no-cache, no-store, must-revalidate');
+        res.setHeader('Pragma', 'no-cache');
+        res.setHeader('Expires', '0');
+      } else {
+        // Cache other static assets
+        res.setHeader('Cache-Control', 'public, max-age=3600');
+      }
+    }
+  }));
+  
+  // Catch-all route for SPA fallback
+  app.get('*', (req, res) => {
+    res.sendFile(path.join(staticDir, 'index.html'));
+  });
+} else {
+  // Fallback if dist doesn't exist yet
+  app.get('*', (req, res) => {
+    res.send('<h3>Frontend not found!</h3><p>Please build the Vue frontend (<code>npm run build</code>) and copy the <code>dist</code> folder into the <code>docker-server</code> directory before running.</p>');
+  });
+}
+
+// Start Server
+app.listen(port, () => {
+  console.log(`ClassHomeworkBoard Server running on port ${port}`);
+  console.log(`Data directory: ${dataDir}`);
+  console.log(`Static files directory: ${staticDir}`);
+});