feat(nocodb): set cache header for attachment urls

Signed-off-by: Pranav C <pranavxc@gmail.com>

packages/nocodb/src/lib/meta/api/attachmentApis.ts

@@ -14,6 +14,7 @@ import catchError, { NcError } from '../helpers/catchError';
 import NcPluginMgrv2 from '../helpers/NcPluginMgrv2';
 import Local from '../../v1-legacy/plugins/adapters/storage/Local';
 import { NC_ATTACHMENT_FIELD_SIZE } from '../../constants';
+import { getCacheMiddleware } from './helpers';
 
 const isUploadAllowed = async (req: Request, _res: Response, next: any) => {
   if (!req['user']?.id) {
@@ -161,7 +162,10 @@ export async function fileRead(req, res) {
 
 const router = Router({ mergeParams: true });
 
-router.get(/^\/dl\/([^/]+)\/([^/]+)\/(.+)$/, async (req, res) => {
+router.get(
+  /^\/dl\/([^/]+)\/([^/]+)\/(.+)$/,
+  getCacheMiddleware(),
+  async (req, res) => {
     try {
       // const type = mimetypes[path.extname(req.params.fileName).slice(1)] || 'text/plain';
       const type =
@@ -186,7 +190,8 @@ router.get(/^\/dl\/([^/]+)\/([^/]+)\/(.+)$/, async (req, res) => {
     } catch (e) {
       res.status(404).send('Not found');
     }
-});
+  }
+);
 
 export function sanitizeUrlPath(paths) {
   return paths.map((url) => url.replace(/[/.?#]+/g, '_'));
@@ -217,6 +222,6 @@ router.post(
   ]
 );
 
-router.get(/^\/download\/(.+)$/, catchError(fileRead));
+router.get(/^\/download\/(.+)$/, getCacheMiddleware(), catchError(fileRead));
 
 export default router;

packages/nocodb/src/lib/meta/api/helpers/cacheHelpers.ts

@@ -0,0 +1,13 @@
+// return a middleware to set cache-control header
+// default period is 30 days
+export const getCacheMiddleware = (period: string | number = 2592000) => {
+  return async (req, res, next) => {
+    const { method } = req;
+    // only cache GET requests
+    if (method === 'GET') {
+      // set cache-control header
+      res.set('Cache-Control', `public, max-age=${period}`);
+    }
+    next();
+  };
+};

packages/nocodb/src/lib/meta/api/helpers/index.ts

@@ -1,5 +1,6 @@
 import { populateMeta } from './populateMeta';
 export * from './columnHelpers';
 export * from './apiHelpers';
+export * from './cacheHelpers';
 
 export { populateMeta };