Closes #805 - Unable to signin on self-hosted installations with non-www subdomain

shared/utils/domains.js

@@ -9,6 +9,13 @@ export function stripSubdomain(hostname: string) {
   return parsed.domain;
 }
 
+export function isCustomSubdomain(hostname: string) {
+  const parsed = parseDomain(hostname);
+  if (!parsed) return false;
+  if (!parsed.subdomain || parsed.subdomain === 'www') return false;
+  return true;
+}
+
 export const RESERVED_SUBDOMAINS = [
   'about',
   'account',

shared/utils/domains.test.js

@@ -1,5 +1,5 @@
 /* eslint-disable flowtype/require-valid-file-annotation */
-import { stripSubdomain } from './domains';
+import { stripSubdomain, isCustomSubdomain } from './domains';
 
 describe('#stripSubdomain', () => {
   test('to work with localhost', () => {
@@ -15,3 +15,22 @@ describe('#stripSubdomain', () => {
     expect(stripSubdomain('test.example.com:3000')).toBe('example.com');
   });
 });
+
+describe('#isCustomSubdomain', () => {
+  test('to work with localhost', () => {
+    expect(isCustomSubdomain('localhost')).toBe(false);
+  });
+  test('to return false for domains without a subdomain', () => {
+    expect(isCustomSubdomain('example')).toBe(false);
+    expect(isCustomSubdomain('example.com')).toBe(false);
+    expect(isCustomSubdomain('example.org:3000')).toBe(false);
+  });
+  test('to return false for www', () => {
+    expect(isCustomSubdomain('www.example.com')).toBe(false);
+    expect(isCustomSubdomain('www.example.com:3000')).toBe(false);
+  });
+  test('to return true for subdomains', () => {
+    expect(isCustomSubdomain('test.example.com')).toBe(true);
+    expect(isCustomSubdomain('test.example.com:3000')).toBe(true);
+  });
+});