Support separate public forms domain

src/app/app/forms/[id]/page.tsx

@@ -5,6 +5,7 @@ import { canEditForm, parseFields, parseSettings } from "@/lib/forms";
 import { listAllTags } from "@/lib/tags";
 import Builder from "@/components/builder/Builder";
 import TagBar from "@/components/ui/TagBar";
+import { publicFormsOrigin } from "@/lib/urls";
 
 export default async function FormPage({ params }: { params: Promise<{ id: string }> }) {
   const { id } = await params;
@@ -48,6 +49,7 @@ export default async function FormPage({ params }: { params: Promise<{ id: strin
         }}
         members={members}
         currentUserId={session.user.id}
+        publicFormsOrigin={publicFormsOrigin()}
       />
     </div>
   );

src/app/app/page.tsx

@@ -4,6 +4,7 @@ import { prisma } from "@/lib/db";
 import { createForm, createFromTemplate } from "@/lib/actions";
 import { TEMPLATES } from "@/lib/templates";
 import { listAllTags } from "@/lib/tags";
+import { publicFormUrl } from "@/lib/urls";
 import { Plus, FileText, Layers } from "lucide-react";
 
 export default async function FormsList({ searchParams }: { searchParams: Promise<{ tag?: string }> }) {
@@ -129,7 +130,7 @@ export default async function FormsList({ searchParams }: { searchParams: Promis
           {forms.map((f) => {
             const canEdit = isAdmin || f.ownerId === userId;
             const canSeeCount = canEdit || f.viewers.length > 0;
-            const href = canEdit ? `/app/forms/${f.id}` : `/f/${f.slug}`;
+            const href = canEdit ? `/app/forms/${f.id}` : publicFormUrl(f.slug);
             const ownerLabel = f.owner.name || f.owner.email;
 
             return (

src/components/builder/Builder.tsx

@@ -81,8 +81,8 @@ function fieldChipClass(type: FieldType): string {
 
 // ── Main component ─────────────────────────────────────────────────────────
 
-export default function Builder({ form: initial, members, currentUserId }: {
-  form: FormData; members: Member[]; currentUserId: string;
+export default function Builder({ form: initial, members, currentUserId, publicFormsOrigin }: {
+  form: FormData; members: Member[]; currentUserId: string; publicFormsOrigin: string;
 }) {
   const [form, setForm] = useState<FormData>(initial);
   const [selectedId, setSelectedId] = useState<string | null>(initial.fields[0]?.id ?? null);
@@ -225,6 +225,7 @@ export default function Builder({ form: initial, members, currentUserId }: {
       {/* ── Top bar ── */}
       <TopBar
         form={form} saving={saving} savedAt={savedAt} tab={tab} setTab={setTab}
+        publicFormUrl={`${publicFormsOrigin}/f/${encodeURIComponent(form.slug)}`}
         onTitleChange={(t) => update({ title: t })}
         onTogglePublish={togglePublish}
         onDelete={async () => {
@@ -401,6 +402,7 @@ export default function Builder({ form: initial, members, currentUserId }: {
             form={form}
             members={members}
             currentUserId={currentUserId}
+            publicFormsOrigin={publicFormsOrigin}
             onSettings={(s) => update({ settings: s })}
           />
         </div>
@@ -411,8 +413,9 @@ export default function Builder({ form: initial, members, currentUserId }: {
 
 // ── Top bar ────────────────────────────────────────────────────────────────
 
-function TopBar({ form, saving, savedAt, tab, setTab, onTitleChange, onTogglePublish, onDelete }: {
+function TopBar({ form, saving, savedAt, tab, setTab, publicFormUrl, onTitleChange, onTogglePublish, onDelete }: {
   form: FormData; saving: boolean; savedAt: number | null; tab: Tab; setTab: (t: Tab) => void;
+  publicFormUrl: string;
   onTitleChange: (t: string) => void; onTogglePublish: () => void; onDelete: () => void;
 }) {
   const statusText = saving ? "Saving…" : savedAt ? "Saved" : null;
@@ -466,7 +469,7 @@ function TopBar({ form, saving, savedAt, tab, setTab, onTitleChange, onTogglePub
           <BarChart2 size={13} />
         </Link>
         {form.published && (
-          <a href={`/f/${form.slug}`} target="_blank" rel="noreferrer"
+          <a href={publicFormUrl} target="_blank" rel="noreferrer"
             className="btn btn-ghost btn-sm btn-icon text-[rgb(var(--muted))]">
             <ExternalLink size={13} />
           </a>
@@ -1168,14 +1171,18 @@ function SettingsConfig({ settings, description, formId, onChange }: {
 
 // ── Share tab ──────────────────────────────────────────────────────────────
 
-function ShareTab({ form, members, currentUserId, onSettings }: {
+function ShareTab({ form, members, currentUserId, publicFormsOrigin, onSettings }: {
   form: FormData; members: Member[]; currentUserId: string;
+  publicFormsOrigin: string;
   onSettings: (s: FormSettings) => void;
 }) {
   const [vis, setVis] = useState(form.settings.visibility ?? "workspace");
   const [viewerIds, setViewerIds] = useState<string[]>(form.viewerIds);
   const [pending, startTransition] = useTransition();
-  const url = useMemo(() => `${typeof window !== "undefined" ? window.location.origin : ""}/f/${form.slug}`, [form.slug]);
+  const url = useMemo(
+    () => `${publicFormsOrigin}/f/${encodeURIComponent(form.slug)}`,
+    [form.slug, publicFormsOrigin],
+  );
 
   const changeVisibility = (v: "workspace" | "public") => {
     setVis(v);
@@ -1231,15 +1238,14 @@ function ShareTab({ form, members, currentUserId, onSettings }: {
         </Button>
       </div>
 
-      <EmbedPanel slug={form.slug} />
+      <EmbedPanel slug={form.slug} publicFormsOrigin={publicFormsOrigin} />
     </div>
   );
 }
 
-function EmbedPanel({ slug }: { slug: string }) {
-  const origin = typeof window !== "undefined" ? window.location.origin : "";
-  const iframe = `<iframe src="${origin}/f/${slug}?embed=1" width="100%" height="700" frameborder="0" style="border:0"></iframe>`;
-  const popup = `<script src="${origin}/embed.js"></script>\n<button data-form="${slug}">Open form</button>`;
+function EmbedPanel({ slug, publicFormsOrigin }: { slug: string; publicFormsOrigin: string }) {
+  const iframe = `<iframe src="${publicFormsOrigin}/f/${slug}?embed=1" width="100%" height="700" frameborder="0" style="border:0"></iframe>`;
+  const popup = `<script src="${publicFormsOrigin}/embed.js"></script>\n<button data-form="${slug}">Open form</button>`;
   return (
     <div className="card p-5 space-y-3 md:col-span-2">
       <div className="panel-label">Embed</div>

src/lib/mcp.ts

@@ -7,6 +7,7 @@ import { canEditForm, canViewResults, parseFields, parseSettings } from "./forms
 import { visibleFields } from "./logic";
 import { recordAudit } from "./audit";
 import { snapshotForm } from "./versions";
+import { publicFormUrl } from "./urls";
 import type { Field, FormSettings } from "./types";
 
 const PROTOCOL_VERSION = "2024-11-05";
@@ -320,7 +321,7 @@ const TOOLS: Record<string, (ctx: Ctx, args: Record<string, unknown>) => Promise
       actorId: ctx.userId, action: "form.created", entityType: "form", entityId: form.id,
       metadata: { title, via: "mcp" },
     });
-    return JSON.stringify({ id: form.id, slug: form.slug, url: `/f/${form.slug}` }, null, 2);
+    return JSON.stringify({ id: form.id, slug: form.slug, url: publicFormUrl(form.slug) }, null, 2);
   },
 
   async list_responses(ctx, args) {

src/lib/urls.test.ts

@@ -0,0 +1,17 @@
+import { describe, expect, test } from "vitest";
+import { publicFormUrl, publicFormsOrigin } from "./urls";
+
+describe("public form URLs", () => {
+  test("uses the dedicated public forms origin", () => {
+    expect(publicFormsOrigin({
+      PUBLIC_FORM_URL: "https://forms.vyntehome.com/",
+      AUTH_URL: "https://forms.internal.vyntehome.com",
+    })).toBe("https://forms.vyntehome.com");
+  });
+
+  test("falls back to the authenticated app origin", () => {
+    expect(publicFormUrl("customer-feedback", {
+      AUTH_URL: "https://forms.internal.vyntehome.com/",
+    })).toBe("https://forms.internal.vyntehome.com/f/customer-feedback");
+  });
+});

src/lib/urls.ts

@@ -0,0 +1,17 @@
+type UrlEnv = {
+  [key: string]: string | undefined;
+  PUBLIC_FORM_URL?: string;
+  AUTH_URL?: string;
+};
+
+export function publicFormsOrigin(env: UrlEnv = process.env) {
+  return trimTrailingSlash(env.PUBLIC_FORM_URL || env.AUTH_URL || "");
+}
+
+export function publicFormUrl(slug: string, env: UrlEnv = process.env) {
+  return `${publicFormsOrigin(env)}/f/${encodeURIComponent(slug)}`;
+}
+
+function trimTrailingSlash(value: string) {
+  return value.replace(/\/+$/, "");
+}