archive.ts

1import type { Hono } from "hono";2import { headId, saveByPrefix } from "../mirror/queries.ts";3import { notFound, openPublicRepo, type PageContext } from "../pages/layout.ts";4import { countInstall } from "../releases/releases.ts";5import { cachedTarball } from "./cache.ts";67// Long-lived but never `immutable` (§18): a strip can change what a save's tarball holds. `private`,8// so no shared cache keeps it after the repo turns private (§20).9const TARBALL_CACHE = "private, max-age=31536000";1011export function registerTarballRoutes(app: Hono, ctx: PageContext, tarballDir: string): void {12	app.get("/:repo/archive/HEAD.tar.gz", (c) => {13		const repo = openPublicRepo(ctx, c.req.param("repo"));14		const head = repo && headId(repo.mirror);15		if (!repo || !head) return notFound(c, ctx);16		const path = `/${repo.settings.name}/archive/${head}.tar.gz`;17		// Nix pins the immutable link in its lock file, so it must be absolute.18		c.header("Link", `<https://${ctx.domain}${path}>; rel="immutable"`);19		c.header("Cache-Control", "no-cache");20		return c.redirect(path, 302);21	});2223	app.get("/:repo/archive/:id{[0-9a-f]+\\.tar\\.gz}", (c) => {24		const repo = openPublicRepo(ctx, c.req.param("repo"));25		const id = c.req.param("id").replace(/\.tar\.gz$/, "");26		const save = repo && saveByPrefix(repo.mirror, id);27		if (!repo || !save) return notFound(c, ctx);28		const name = repo.settings.name;29		if (save.id !== id) {30			c.header("Cache-Control", "public, max-age=60");31			return c.redirect(`/${name}/archive/${save.id}.tar.gz`, 302);32		}33		const bytes = cachedTarball(tarballDir, repo.mirror, name, save.id);34		// §22.2: a Nix fetch is an install. Only the tarball itself counts, not the redirects to it.35		if (c.req.header("User-Agent")?.includes("nix/")) countInstall(ctx.kepr, name);36		c.header("Content-Type", "application/gzip");37		c.header("Content-Disposition", `attachment; filename="${name}-${save.id.slice(0, 8)}.tar.gz"`);38		c.header("Cache-Control", TARBALL_CACHE);39		return c.body(bytes);40	});41}