freezmo/lib/share-inbox.ts

/**
 * Short-lived, single-use store for content shared into Freezmo from another
 * app (the Web Share Target POST). Lives in memory only, expires after ten
 * minutes and is deleted on first read — nothing is written to disk.
 */

export type SharedFile = { name: string; type: string; data: string };

export type SharedPayload = {
  title?: string;
  text?: string;
  url?: string;
  files: SharedFile[];
  expires: number;
};

type Store = Map<string, SharedPayload>;

const globalStore = globalThis as typeof globalThis & { __freezmoShareStore?: Store };
const store: Store = (globalStore.__freezmoShareStore ??= new Map());

const TTL_MS = 10 * 60 * 1000;
export const MAX_SHARE_BYTES = 30 * 1024 * 1024;

function prune(): void {
  const now = Date.now();
  for (const [id, payload] of store) {
    if (payload.expires < now) store.delete(id);
  }
}

export function putShare(id: string, payload: Omit<SharedPayload, "expires">): void {
  prune();
  store.set(id, { ...payload, expires: Date.now() + TTL_MS });
}

export function takeShare(id: string): SharedPayload | null {
  prune();
  const payload = store.get(id);
  if (!payload) return null;
  store.delete(id);
  return payload;
}