Refine subscription import and refresh flow

test/web/client-controls.test.js

@@ -6,6 +6,7 @@ import {
   copyText,
   formatConnectionDuration,
   formatConnectionDurationWords,
+  isSubscriptionUrlValid,
   localProxyUrls,
   subscriptionDomain,
   subscriptionDaysLeft,
@@ -44,6 +45,13 @@ test('saved subscription is reduced to its public domain', () => {
   assert.equal(subscriptionDomain(''), '');
 });
 
+test('subscription URL is validated locally by shape', () => {
+  assert.equal(isSubscriptionUrlValid(' https://sub.example/token '), true);
+  assert.equal(isSubscriptionUrlValid('http://127.0.0.1/subscription'), true);
+  assert.equal(isSubscriptionUrlValid('ftp://sub.example/token'), false);
+  assert.equal(isSubscriptionUrlValid('not-a-url'), false);
+});
+
 test('local proxy exposes both supported URLs', () => {
   assert.deepEqual(localProxyUrls(18080), {
     socks5: 'socks5://127.0.0.1:18080',