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The logic for serving and storing associations between users and apps
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172import { bearerToken, DEVICE_TOKEN_HEADER } from "./device-token";
export type StorageAccessState = "none" | "inactive" | "active";
export function storageAccessState(request: Request): StorageAccessState | null { const raw = (request.headers.get("Sec-Fetch-Storage-Access") ?? "").trim().toLowerCase(); if (raw === "none" || raw === "inactive" || raw === "active") return raw; return null;}
export function embedderOrigin(request: Request): string | null { const origin = request.headers.get("Origin"); if (origin && origin !== "null") return origin; const referer = request.headers.get("Referer"); if (!referer) return null; try { return new URL(referer).origin; } catch { return null; }}
export function shouldAttachSessionCookie(request: Request): boolean { // A native caller authenticates with its token; minting a cookie for it would // orphan a Durable Object nobody can reach again. if (bearerToken(request.headers.get(DEVICE_TOKEN_HEADER)) !== null) return false; const access = storageAccessState(request); if (access === "none" || access === "inactive") return false; if (access === "active") return true; const site = request.headers.get("Sec-Fetch-Site"); if (site === "cross-site") return false; return true;}
export function activateRetryHeaders(allowedOrigin: string): Headers { const headers = new Headers(); headers.set("Activate-Storage-Access", `retry; allowed-origin="${allowedOrigin}"`); headers.set("Vary", "Sec-Fetch-Storage-Access"); headers.set("cache-control", "no-store"); return headers;}
export function activateLoadHeaders(): Headers { const headers = new Headers(); headers.set("Activate-Storage-Access", "load"); headers.set("Vary", "Sec-Fetch-Storage-Access"); return headers;}
export function storageAccessRetryResponse(allowedOrigin: string): Response { return new Response(null, { status: 401, headers: activateRetryHeaders(allowedOrigin), });}
export function withStorageAccessHeaders(request: Request, response: Response): Response { const access = storageAccessState(request); const headers = new Headers(response.headers); if (!headers.has("Vary")) headers.set("Vary", "Sec-Fetch-Storage-Access"); else if (!headers.get("Vary")?.includes("Sec-Fetch-Storage-Access")) { headers.append("Vary", "Sec-Fetch-Storage-Access"); } if (access === "active") { headers.set("Activate-Storage-Access", "load"); } return new Response(response.body, { status: response.status, headers, });}