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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,44 +1,53 @@ | ||
| <!DOCTYPE html> | ||
| <html> | ||
| <html style="height: 100%; width: 100%;"> | ||
| <head> | ||
| <link rel="canonical" href="/"> | ||
| <script type="module"> | ||
| try { | ||
| const latestScriptUrl = new URL(`/service_worker.latest.js`, location.href) | ||
| const latestScriptRes = await fetch(latestScriptUrl, { cache: "reload" }) | ||
|
|
||
| <head> | ||
| <script type="module"> | ||
| const message = document.createElement("div") | ||
| message.textContent = "Loading..." | ||
| document.body.appendChild(message) | ||
| if (!latestScriptRes.ok) | ||
| throw new Error(`Failed to fetch latest service-worker`) | ||
|
|
||
| try { | ||
| const latestScriptUrl = new URL(`/service_worker.latest.js`, location.href) | ||
| const latestScriptRes = await fetch(latestScriptUrl, { cache: "reload" }) | ||
| const cache = latestScriptRes.headers.get("cache-control") | ||
|
|
||
| if (!cache?.includes("immutable")) | ||
| alert("This webapp is not distributed as immutable. Use it at your own risk.") | ||
|
|
||
| if (!latestScriptRes.ok) | ||
| throw new Error(`Failed to fetch latest service-worker`) | ||
| if (latestScriptRes.headers.get("cache-control") !== "public, max-age=31536000, immutable") | ||
| throw new Error(`Wrong Cache-Control header for latest service-worker`) | ||
| const ttl = cache?.split(",").map(s => s.trim()).find(s => s.startsWith("max-age="))?.split("=").at(-1) | ||
|
|
||
| const { pathname } = latestScriptUrl | ||
| if (ttl !== "31536000") | ||
| alert("This webapp is distributed with a time-to-live of less than 1 year. Use it at your own risk.") | ||
|
|
||
| const filename = pathname.split("/").at(-1) | ||
| const basename = filename.split(".").at(0) | ||
| const { pathname } = latestScriptUrl | ||
|
|
||
| const latestHashBytes = new Uint8Array(await crypto.subtle.digest("SHA-256", await latestScriptRes.arrayBuffer())) | ||
| const latestHashRawHex = Array.from(latestHashBytes).map(b => b.toString(16).padStart(2, "0")).join("") | ||
| const latestVersion = latestHashRawHex.slice(0, 6) | ||
| const filename = pathname.split("/").at(-1) | ||
| const basename = filename.split(".").at(0) | ||
|
|
||
| const latestVersionScriptPath = `${basename}.${latestVersion}.js` | ||
| const latestVersionScriptUrl = new URL(latestVersionScriptPath, latestScriptUrl) | ||
| const latestHashBytes = new Uint8Array(await crypto.subtle.digest("SHA-256", await latestScriptRes.arrayBuffer())) | ||
| const latestHashRawHex = Array.from(latestHashBytes).map(b => b.toString(16).padStart(2, "0")).join("") | ||
| const latestVersion = latestHashRawHex.slice(0, 6) | ||
|
|
||
| localStorage.setItem("service_worker.current.version", JSON.stringify(latestVersion)) | ||
| const latestVersionScriptPath = `${basename}.${latestVersion}.js` | ||
| const latestVersionScriptUrl = new URL(latestVersionScriptPath, latestScriptUrl) | ||
|
|
||
| await navigator.serviceWorker.register(latestVersionScriptUrl, { updateViaCache: "all" }) | ||
| await navigator.serviceWorker.ready | ||
| localStorage.setItem("service_worker.current.version", JSON.stringify(latestVersion)) | ||
|
|
||
| location.reload() | ||
| } catch (error) { | ||
| message.textContent = "Failed to load." | ||
| console.error(error) | ||
| } | ||
| </script> | ||
| </head> | ||
| await navigator.serviceWorker.register(latestVersionScriptUrl, { updateViaCache: "all" }) | ||
| await navigator.serviceWorker.ready | ||
|
|
||
| location.reload() | ||
| } catch (error) { | ||
| console.error(error) | ||
|
|
||
| alert(`An error occurred when loading this website. Please try again later.`) | ||
| } | ||
| </script> | ||
| </head> | ||
| <body style="height: 100%; width: 100%; display: flex; justify-content: center; align-items: center; overflow: hidden;"> | ||
| <img style="width: 100px; height: 100px;" | ||
| src="/favicon.png" | ||
| alt="favicon" /> | ||
| </body> | ||
| </html> |
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