feat: allow personal gmail accounts to be used to sign into teams with an existing invite (#3652)

* feat: allow personal gmail accounts to be used to sign into teams with an existing invite

* address comments

* add comment for appDomain

* address comments

shared/utils/domains.test.ts

@@ -42,6 +42,13 @@ describe("#parseDomain", () => {
     });
   });
 
+  it("should return the same result when parsing the returned host", () => {
+    const customDomain = parseDomain("www.example.com");
+    const subDomain = parseDomain("myteam.example.com");
+    expect(parseDomain(customDomain.host)).toMatchObject(customDomain);
+    expect(parseDomain(subDomain.host)).toMatchObject(subDomain);
+  });
+
   it("should remove the path", () => {
     expect(parseDomain("example.com/some/path?and&query")).toMatchObject({
       teamSubdomain: "",

shared/utils/urlHelpers.ts

@@ -49,7 +49,7 @@ export function changelogUrl(): string {
 }
 
 export function signin(service = "slack"): string {
-  return `${env.URL}/auth/${service}`;
+  return `/auth/${service}`;
 }
 
 export const SLUG_URL_REGEX = /^(?:[0-9a-zA-Z-_~]*-)?([a-zA-Z0-9]{10,15})$/;