🐛 Fixed missing filename when exporting subscribers csv

closes #10075

- the filename was missing

core/server/api/shared/headers.js

@@ -11,8 +11,14 @@ const cacheInvalidate = (result, options = {}) => {
 
 const disposition = {
     csv(result, options = {}) {
+        let value = options.value;
+
+        if (typeof options.value === 'function') {
+            value = options.value();
+        }
+
         return {
-            'Content-Disposition': options.value,
+            'Content-Disposition': value,
             'Content-Type': 'text/csv'
         };
     },

core/server/api/v2/subscribers.js

@@ -140,7 +140,11 @@ const subscribers = {
     exportCSV: {
         headers: {
             disposition: {
-                type: 'csv'
+                type: 'csv',
+                value() {
+                    const datetime = (new Date()).toJSON().substring(0, 10);
+                    return `Attachment; filename="subscribers.${datetime}.csv"`;
+                }
             }
         },
         response: {

core/test/functional/api/v2/admin/subscribers_spec.js

@@ -199,7 +199,7 @@ describe('Subscribers API', function () {
             .expect(200)
             .then((res) => {
                 should.not.exist(res.headers['x-cache-invalidate']);
-
+                res.headers['content-disposition'].should.match(/Attachment;\sfilename="subscribers/);
                 res.text.should.match(/id,email,created_at,deleted_at/);
                 res.text.should.match(/subscriber1@test.com/);
             });