Source

// The pastes this browser made or manages, kept in localStorage: id, owner key, and what the list shows.
// A paste encrypted with a key in the link also keeps that key here, so its owner can reopen the full link.
// A password is never kept.
export interface Saved { id: string; key: string; title: string; language: string; createdAt: number; ttl: number; burn: boolean; secret?: string; password?: boolean }

const STORE = "paste:mine";

const isSaved = (s: any): s is Saved => s && typeof s.id === "string" && typeof s.key === "string" && typeof s.createdAt === "number";
export const isExpired = (s: { createdAt: number; ttl: number }) => s.ttl > 0 && s.createdAt + s.ttl <= Date.now() / 1000;

export function savedPastes(): Saved[] {
  try {
    const list = JSON.parse(localStorage.getItem(STORE) || "[]");
    return Array.isArray(list) ? list.filter(isSaved) : [];
  } catch {
    return [];
  }
}

export const savedPaste = (id: string) => savedPastes().find((s) => s.id === id) ?? null;

function write(list: Saved[]) {
  try { localStorage.setItem(STORE, JSON.stringify(list)); } catch { /* storage full or blocked: the list is a convenience */ }
  window.dispatchEvent(new Event("paste:saved"));
}

/** Remembers a paste newest first, or refreshes what the list shows for one already saved. */
export function savePaste(s: Saved) {
  const list = savedPastes();
  const old = list.find((x) => x.id === s.id);
  write(old ? list.map((x) => (x.id === s.id ? { ...x, ...s, secret: s.secret ?? x.secret } : x)) : [s, ...list]);
}

export function forgetPaste(id: string) {
  write(savedPastes().filter((s) => s.id !== id));
}