| 1 | import { env } from "cloudflare:workers"; |
| 2 | |
| 3 | import type { Route } from "./+types/downloads-runner"; |
| 4 | |
| 5 | /** |
| 6 | * The self-hosted runner's releases: `g1t.sh/downloads/runner/<version>/<file>`, |
| 7 | * served from the g1t-downloads R2 bucket that scripts/runner-release.mjs |
| 8 | * publishes to. `latest/<file>` is the newest release's, as its signed |
| 9 | * `latest.json` names it; `latest.json` and `latest.json.sig` themselves |
| 10 | * are what runners check before updating. |
| 11 | */ |
| 12 | const TYPES: Record<string, string> = { |
| 13 | json: "application/json", |
| 14 | sig: "text/plain; charset=utf-8", |
| 15 | txt: "text/plain; charset=utf-8", |
| 16 | }; |
| 17 | |
| 18 | async function object(key: string): Promise<R2ObjectBody | null> { |
| 19 | const bucket = env.DOWNLOADS; |
| 20 | return bucket ? bucket.get(key) : null; |
| 21 | } |
| 22 | |
| 23 | export async function loader({ params }: Route.LoaderArgs) { |
| 24 | const path = (params["*"] ?? "").replace(/^\/+/, ""); |
| 25 | if (!path || path.includes("..") || !/^[A-Za-z0-9._/-]+$/.test(path)) throw new Response("Not found\n", { status: 404 }); |
| 26 | let key = `runner/${path}`; |
| 27 | // `latest/<file>`: the file of the newest release. |
| 28 | if (path.startsWith("latest/")) { |
| 29 | const manifest = await object("runner/latest.json"); |
| 30 | if (!manifest) throw new Response("No release yet\n", { status: 404 }); |
| 31 | const { version } = (await manifest.json()) as { version: string }; |
| 32 | key = `runner/${version}/${path.slice("latest/".length)}`; |
| 33 | } |
| 34 | const found = await object(key); |
| 35 | if (!found) throw new Response("Not found\n", { status: 404 }); |
| 36 | const name = key.split("/").pop() ?? "g1t-runner"; |
| 37 | const extension = name.includes(".") ? name.split(".").pop()! : ""; |
| 38 | const headers = new Headers({ |
| 39 | "content-type": TYPES[extension] ?? "application/octet-stream", |
| 40 | etag: found.httpEtag, |
| 41 | // A version's files never change; what `latest` points to does. |
| 42 | "cache-control": path.startsWith("latest") ? "public, max-age=300" : "public, max-age=31536000, immutable", |
| 43 | }); |
| 44 | if (!TYPES[extension]) headers.set("content-disposition", `attachment; filename="${name}"`); |
| 45 | return new Response(found.body, { headers }); |
| 46 | } |