fix(dashboard): use verified custom domain for view-as-student handoff (#677)

* fix(dashboard): use verified custom domain for view-as-student handoff

Prefer the org's verified custom domain over window.location.origin when
resolving the public tenant host. This prevents admin URLs like
app.example.com from being used for the student login-link handoff when
the org's public site is example.com.

Co-authored-by: Rotimi Best <[email protected]>

* fix(dashboard): keep self-hosted org origin on window.location

Self-hosted deployments serve admin and LMS from the same URL, so
getOrgPublicOrigin should always return window.location.origin there
rather than preferring a configured custom domain.

Co-authored-by: Rotimi Best <[email protected]>

---------

Co-authored-by: Cursor Agent <[email protected]>
Co-authored-by: Rotimi Best <[email protected]>

apps/dashboard/src/lib/features/course/utils/course-preview.ts

@@ -1,7 +1,9 @@
+import { get } from 'svelte/store';
 import { goto } from '$app/navigation';
 import { resolve } from '$app/paths';
 import { snackbar } from '$features/ui/snackbar/store';
 import { accountApi } from '$features/account/api/account.svelte';
+import { currentOrg, getOrgPublicOrigin } from '$lib/utils/store/org';
 
 interface OpenCoursePreviewOptions {
   courseId: string;
@@ -21,7 +23,7 @@ export function getPublicCoursePageUrl(courseSlug: string, currentOrgDomain = ''
   }
 
   const trimmedDomain = currentOrgDomain?.trim();
-  const origin = trimmedDomain || window.location.origin;
+  const origin = trimmedDomain || getOrgPublicOrigin(get(currentOrg));
 
   return new URL(resolve(`/course/${courseSlug}`, {}), origin).toString();
 }
@@ -73,7 +75,7 @@ export async function viewAsStudent({ courseId, currentOrgDomain = '' }: ViewAsS
     return false;
   }
 
-  const origin = currentOrgDomain?.trim() || window.location.origin;
+  const origin = currentOrgDomain?.trim() || getOrgPublicOrigin(get(currentOrg));
   const loginLinkUrl = new URL('/api/auth/login-link', origin);
   loginLinkUrl.searchParams.set('token', token);
   loginLinkUrl.searchParams.set('redirect', `/courses/${courseId}/lessons?next=true`);

apps/dashboard/src/lib/utils/store/org.ts

@@ -77,19 +77,34 @@ export const currentOrgPath = derived(currentOrg, ($currentOrg) =>
   $currentOrg.siteName ? `/org/${$currentOrg.siteName}` : '#'
 );
 
-export const currentOrgDomain = derived(currentOrg, ($currentOrg) => {
-  if (PUBLIC_IS_SELFHOSTED === 'true') return window.location.origin;
+type OrgPublicOrigin = Pick<AccountOrg, 'customDomain' | 'isCustomDomainVerified' | 'siteName'>;
 
-  const browserOrigin = dev && browser && window.location.origin;
+/**
+ * Public origin for an org's tenant site (student LMS, public course pages, login-link handoff).
+ * Self-hosted uses the current deployment URL. On cloud, verified custom domains win over the
+ * admin host so `app.classroomio.com` still hands off to the org's `example.com` tenant site.
+ */
+export function getOrgPublicOrigin(org: OrgPublicOrigin): string {
+  if (PUBLIC_IS_SELFHOSTED === 'true') {
+    return browser ? window.location.origin : '';
+  }
 
-  return browserOrigin
-    ? browserOrigin
-    : $currentOrg.customDomain && $currentOrg.isCustomDomainVerified
-      ? `https://${$currentOrg.customDomain}`
-      : $currentOrg.siteName
-        ? `https://${$currentOrg.siteName}.${TENANT_ROOT_DOMAIN}`
-        : '';
-});
+  if (org.customDomain && org.isCustomDomainVerified) {
+    return `https://${org.customDomain}`;
+  }
+
+  if (dev && browser) {
+    return window.location.origin;
+  }
+
+  if (org.siteName) {
+    return `https://${org.siteName}.${TENANT_ROOT_DOMAIN}`;
+  }
+
+  return browser ? window.location.origin : '';
+}
+
+export const currentOrgDomain = derived(currentOrg, ($currentOrg) => getOrgPublicOrigin($currentOrg));
 
 export const isFreePlan = derived(currentOrg, ($currentOrg) => {
   if (!$currentOrg.id || PUBLIC_IS_SELFHOSTED === 'true') return false;