feat: download test cases csv (#219)

backend/routes/cases/download.js

@@ -0,0 +1,48 @@
+const express = require('express');
+const router = express.Router();
+const { DataTypes } = require('sequelize');
+const Papa = require('papaparse');
+const defineCase = require('../../models/cases');
+
+module.exports = function (sequelize) {
+  const Case = defineCase(sequelize, DataTypes);
+  const { verifySignedIn } = require('../../middleware/auth')(sequelize);
+  const { verifyProjectVisibleFromFolderId } = require('../../middleware/verifyVisible')(sequelize);
+
+  router.get('/download', verifySignedIn, verifyProjectVisibleFromFolderId, async (req, res) => {
+    const { folderId, type } = req.query;
+
+    if (!folderId) {
+      return res.status(400).json({ error: 'folderId is required' });
+    }
+
+    if (!type) {
+      return res.status(400).json({ error: 'download type is required' });
+    }
+
+    try {
+      const cases = await Case.findAll({
+        where: { folderId },
+        raw: true,
+      });
+
+      if (cases.length === 0) {
+        return res.status(404).send('No cases found');
+      }
+
+      const csv = Papa.unparse(cases, {
+        quotes: true,
+        skipEmptyLines: true,
+      });
+
+      res.setHeader('Content-Type', 'text/csv; charset=utf-8');
+      res.setHeader('Content-Disposition', `attachment; filename=cases_folder_${folderId}.csv`);
+      res.send(csv);
+    } catch (error) {
+      console.error(error);
+      res.status(500).send('Internal Server Error');
+    }
+  });
+
+  return router;
+};