feat: scope login attempts to specific subdomains if available - do not switch subdomains (#3741)

* make the user lookup in user creator sensitive to team
* add team specific logic to oidc strat
* factor out slugifyDomain
* change type of req during auth to Koa.Context

shared/utils/domains.test.ts

@@ -1,5 +1,5 @@
 import env from "@shared/env";
-import { parseDomain, getCookieDomain } from "./domains";
+import { parseDomain, getCookieDomain, slugifyDomain } from "./domains";
 
 // test suite is based on subset of parse-domain module we want to support
 // https://github.com/peerigon/parse-domain/blob/master/test/parseDomain.test.js
@@ -158,6 +158,14 @@ describe("#parseDomain", () => {
   });
 });
 
+describe("#slugifyDomain", () => {
+  it("strips the last . delineated segment from strings", () => {
+    expect(slugifyDomain("foo.co")).toBe("foo");
+    expect(slugifyDomain("foo.co.uk")).toBe("foo-co");
+    expect(slugifyDomain("www.foo.co.uk")).toBe("www-foo-co");
+  });
+});
+
 describe("#getCookieDomain", () => {
   beforeEach(() => {
     env.URL = "https://example.com";