Upload public.js

backend/src/routes/public.js

@@ -262,6 +262,27 @@ router.get('/api-view/:userId/:pptId/:slideIndex?', async (req, res, next) => {
 
     const slideIdx = parseInt(slideIndex);
     
+    // 验证 slideIndex 是否为有效数字
+    if (isNaN(slideIdx)) {
+      console.log(`❌ Invalid slide index format: ${slideIndex}`);
+      
+      if (format === 'svg') {
+        const invalidIndexSvg = `<svg width="800" height="450" xmlns="http://www.w3.org/2000/svg">
+          <rect width="100%" height="100%" fill="#f8f9fa"/>
+          <text x="400" y="200" text-anchor="middle" font-family="Arial, sans-serif" font-size="24" fill="#6c757d">Invalid Slide Index</text>
+          <text x="400" y="250" text-anchor="middle" font-family="Arial, sans-serif" font-size="16" fill="#6c757d">Slide index "${slideIndex}" is not a valid number</text>
+          <text x="400" y="300" text-anchor="middle" font-family="Arial, sans-serif" font-size="12" fill="#999">${new Date().toISOString()}</text>
+        </svg>`;
+        
+        res.setHeader('Content-Type', 'image/svg+xml; charset=utf-8');
+        return res.send(invalidIndexSvg);
+      } else {
+        const errorPage = generateErrorPage('Invalid Slide Index', `Slide index "${slideIndex}" is not a valid number.`);
+        res.setHeader('Content-Type', 'text/html; charset=utf-8');
+        return res.status(400).send(errorPage);
+      }
+    }
+    
     // 安全检查：确保 slides 数组存在
     if (!pptData.slides || !Array.isArray(pptData.slides)) {
       console.log(`❌ Invalid PPT data: slides array not found`);