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Fix: parked domains blank because CSP frame-ancestors blocks the masked-forward iframe #14

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Merged
ralyodio merged 1 commit into from
Jul 10, 2026
Merged

Fix: parked domains blank because CSP frame-ancestors blocks the masked-forward iframe #14

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16 changes: 13 additions & 3 deletions middleware.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -4,9 +4,19 @@ import { NextRequest, NextResponse } from "next/server";
// e.g. moshcode.sh). Read at RUNTIME so FRAME_ANCESTORS env changes take effect
// on redeploy without a code edit. 'self' lets the app frame itself; no other
// origin can (anti-clickjacking).
function frameAncestors(): string {
function frameAncestors(req: NextRequest): string {
const parked = (process.env.FRAME_ANCESTORS || "https://moshcode.sh").split(/\s+/).filter(Boolean);
return ["'self'", ...parked].join(" ");
const allow = ["'self'", ...parked];

// Auto-allow the parked domain currently being rendered. A masked-forwarded
// domain frames moshcoding.com/?dn=<self>, so the frame request carries its
// own ?dn; trust it to iframe just its own tenant page. This means new parked
// domains work without hand-editing FRAME_ANCESTORS for each one.
const dn = (req.nextUrl.searchParams.get("dn") || "").trim().toLowerCase();
if (dn.length <= 253 && /^[a-z0-9](?:[a-z0-9-]*[a-z0-9])?(?:\.[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)+$/.test(dn)) {
allow.push(`https://${dn}`, `https://www.${dn}`);
}
return allow.join(" ");
}

// Redirect www.moshcoding.com → https://moshcoding.com (apex, permanent).
Expand All @@ -21,7 +31,7 @@ export function middleware(req: NextRequest) {
return NextResponse.redirect(url, 308);
}
const res = NextResponse.next();
res.headers.set("Content-Security-Policy", `frame-ancestors ${frameAncestors()}`);
res.headers.set("Content-Security-Policy", `frame-ancestors ${frameAncestors(req)}`);

// Referral attribution: a ?ref=<code> visit drops a 90-day cookie (first-touch
// — the first ref a visitor arrives with sticks). Signup/waitlist read it so
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