38 lines
1.9 KiB
JavaScript
38 lines
1.9 KiB
JavaScript
// update.js: an installed Havre has no address bar to refresh from, so the page notices when a new version has been
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// published and offers a reload, like gandora's pill. It fingerprints the files the app is made of when it opens,
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// checks again whenever it comes back to the foreground (and every ten minutes), and shows the pill when they differ.
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// Checking fetches with cache: "reload", which also refreshes the browser's copies, so the reload gets the new files.
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(() => {
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const FILES = ["./", "app.js", "style.css", "workflows.js", "abilities.js", "card.js", "venice.js", "memory.js",
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"threads.js", "media.js", "backup.js", "theme.js"];
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let base = null, shown = false, busy = false;
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async function print() {
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const parts = await Promise.all(FILES.map((f) => fetch(f, { cache: "reload" }).then((r) => (r.ok ? r.text() : "")).catch(() => null)));
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if (parts.some((p) => p === null)) return null; // offline: no verdict
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const d = await crypto.subtle.digest("SHA-256", new TextEncoder().encode(parts.join("\u0000")));
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return Array.from(new Uint8Array(d), (b) => b.toString(16).padStart(2, "0")).join("");
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}
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function show() {
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if (shown) return;
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shown = true;
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const b = document.createElement("button");
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b.id = "upd"; b.type = "button"; b.textContent = "NEW VERSION · RELOAD";
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b.addEventListener("click", () => location.reload());
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document.body.append(b);
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}
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async function check() {
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if (busy || shown || !crypto.subtle) return;
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busy = true;
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try {
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const now = await print();
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if (!now) return;
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if (!base) base = now;
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else if (now !== base) show();
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} finally { busy = false; }
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}
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if (location.protocol !== "https:") return;
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setTimeout(check, 3000);
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setInterval(check, 10 * 60 * 1000);
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document.addEventListener("visibilitychange", () => { if (document.visibilityState === "visible") check(); });
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})();
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