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) {
@@ -161,32 +162,36 @@ export async function fileRead(req, res) {
 
 const router = Router({ mergeParams: true });
 
-router.get(/^\/dl\/([^/]+)\/([^/]+)\/(.+)$/, async (req, res) => {
-  try {
-    // const type = mimetypes[path.extname(req.params.fileName).slice(1)] || 'text/plain';
-    const type =
-      mimetypes[path.extname(req.params[2]).split('/').pop().slice(1)] ||
-      'text/plain';
-
-    const storageAdapter = await NcPluginMgrv2.storageAdapter();
-    // const img = await this.storageAdapter.fileRead(slash(path.join('nc', req.params.projectId, req.params.dbAlias, 'uploads', req.params.fileName)));
-    const img = await storageAdapter.fileRead(
-      slash(
-        path.join(
-          'nc',
-          req.params[0],
-          req.params[1],
-          'uploads',
-          ...req.params[2].split('/')
+router.get(
+  /^\/dl\/([^/]+)\/([^/]+)\/(.+)$/,
+  getCacheMiddleware(),
+  async (req, res) => {
+    try {
+      // const type = mimetypes[path.extname(req.params.fileName).slice(1)] || 'text/plain';
+      const type =
+        mimetypes[path.extname(req.params[2]).split('/').pop().slice(1)] ||
+        'text/plain';
+
+      const storageAdapter = await NcPluginMgrv2.storageAdapter();
+      // const img = await this.storageAdapter.fileRead(slash(path.join('nc', req.params.projectId, req.params.dbAlias, 'uploads', req.params.fileName)));
+      const img = await storageAdapter.fileRead(
+        slash(
+          path.join(
+            'nc',
+            req.params[0],
+            req.params[1],
+            'uploads',
+            ...req.params[2].split('/')
+          )
         )
-      )
-    );
-    res.writeHead(200, { 'Content-Type': type });
-    res.end(img, 'binary');
-  } catch (e) {
-    res.status(404).send('Not found');
+      );
+      res.writeHead(200, { 'Content-Type': type });
+      res.end(img, 'binary');
+    } 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 };