routes.ts

1import { readFileSync } from "node:fs";2import { join } from "node:path";3import type { Context, Hono } from "hono";4import type { BucketReader } from "../bucket/reader.ts";5import { isPlatform, isVersion, type ReleaseFile } from "../bucket/repo.ts";6import { headId, repoStats, saveByPrefix } from "../mirror/queries.ts";7import { notFound, openPublicRepo, type PageContext, type PublicRepo } from "../pages/layout.ts";8import { readmeAtHead, readmeIntro } from "../pages/repo.ts";9import {10	checksumsTxt,11	historyJson,12	legacyReleaseJson,13	metaJson,14	releaseJson,15	updateInfoJson,16} from "./feeds.ts";17import { countDownload, type Release, releaseContentType, visibleReleases } from "./releases.ts";1819/**20 * §22.4: Koh 2's `koh update` reads `/api/koh/releases/latest`, built into every Koh 2 binary. The21 * route stays on Koh 2's last release forever, never the repo's newest, so a Koh 2 install is never22 * offered Koh 3.23 */24const FROZEN_KOH2 = { repo: "koh", version: "2.1.16" } as const;2526// §22.5: one generic script; each repo gets its own name and address filled in.27const INSTALL_SH = readFileSync(join(import.meta.dir, "install.sh"), "utf8");2829const JSON_TYPE = "application/json; charset=UTF-8";30const TEXT_TYPE = "text/plain; charset=UTF-8";31// Kepr 2's error bodies. A private repo answers exactly as an unknown one (§20).32const REPO_NOT_FOUND = '{"error":"repo_not_found","message":"repo not found"}';33const NO_RELEASES = '{"error":"not_found","message":"no releases"}';34const RELEASE_NOT_FOUND = '{"error":"not_found","message":"release not found"}';3536type Feed = { repo: PublicRepo; releases: Release[] };3738export function registerReleaseRoutes(app: Hono, ctx: PageContext, bucket: BucketReader): void {39	const send = (c: Context, status: 200 | 404, body: string, type = JSON_TYPE) =>40		c.body(body, status, { "Content-Type": type });41	const feed = (name: string): Feed | null => {42		const repo = openPublicRepo(ctx, name);43		return repo && { repo, releases: visibleReleases(ctx.kepr, repo.mirror, name) };44	};45	// Counted before the redirect (§22.2); Kepr never streams a release file itself.46	const download = (c: Context, repo: string, version: string, file: ReleaseFile) => {47		countDownload(ctx.kepr, repo, version, file.platform);48		const key = `${repo}/releases/${version}/${file.platform}/${file.name}`;49		c.header("Cache-Control", "no-store");50		return c.redirect(bucket.downloadUrl(key, file.name, releaseContentType(file.name)), 302);51	};52	const downloadAt = (c: Context, name: string, version: string, requested: string) => {53		const f = feed(name);54		if (!f) return send(c, 404, REPO_NOT_FOUND);55		// Kepr 2's download links end in `<repo>-<platform>`, so `curl -O` saves a telling name.56		const platform = requested.startsWith(`${name}-`)57			? requested.slice(name.length + 1)58			: requested;59		const release = f.releases.find((r) => r.version === version);60		const file = isPlatform(platform) && release?.files.find((x) => x.platform === platform);61		return file ? download(c, name, version, file) : send(c, 404, RELEASE_NOT_FOUND);62	};63	// The newest visible release, or the response that says why there is none.64	const newest = (c: Context, name: string): Release | Response => {65		const f = feed(name);66		if (!f) return send(c, 404, REPO_NOT_FOUND);67		return f.releases[0] ?? send(c, 404, NO_RELEASES);68	};6970	app.get("/api/koh/releases/latest", (c) => {71		const f = feed(FROZEN_KOH2.repo);72		const release = f?.releases.find((r) => r.version === FROZEN_KOH2.version);73		if (!release) return send(c, 404, '{"error":"no_releases","message":"no releases available"}');74		return send(c, 200, legacyReleaseJson(ctx.domain, FROZEN_KOH2.repo, release));75	});76	app.get("/api/koh/releases/:version/:platform", (c) =>77		downloadAt(c, FROZEN_KOH2.repo, c.req.param("version"), c.req.param("platform")),78	);79	for (const [path, cors] of [80		["/api/:repo/releases/latest", true],81		["/:repo/releases/latest.json", false],82	] as const) {83		app.get(path, (c) => {84			// §22.4 puts CORS on the route, so its 404s carry it too (Kepr 2 sent it only on success).85			if (cors) c.header("Access-Control-Allow-Origin", "*");86			const release = newest(c, c.req.param("repo"));87			if (release instanceof Response) return release;88			return send(c, 200, releaseJson(ctx.domain, c.req.param("repo"), release));89		});90	}91	for (const [path, cors] of [92		["/api/:repo/releases/history", true],93		["/:repo/releases/history.json", false],94	] as const) {95		app.get(path, (c) => {96			if (cors) c.header("Access-Control-Allow-Origin", "*");97			const f = feed(c.req.param("repo"));98			if (!f) return send(c, 404, REPO_NOT_FOUND);99			if (f.releases.length === 0) return send(c, 404, NO_RELEASES);100			return send(c, 200, historyJson(f.releases));101		});102	}103	app.get("/:repo/releases/latest", (c) => {104		const repo = openPublicRepo(ctx, c.req.param("repo"));105		if (!repo) return notFound(c, ctx);106		return c.redirect(`/${repo.settings.name}/releases`, 302);107	});108	app.get("/:repo/releases/latest/version.txt", (c) => {109		const release = newest(c, c.req.param("repo"));110		return release instanceof Response ? release : send(c, 200, release.version, TEXT_TYPE);111	});112	app.get("/:repo/releases/:version/checksums.txt", (c) => {113		const name = c.req.param("repo");114		const f = feed(name);115		if (!f) return send(c, 404, REPO_NOT_FOUND);116		const release = f.releases.find((r) => r.version === c.req.param("version"));117		if (!release) return send(c, 404, RELEASE_NOT_FOUND);118		return send(c, 200, checksumsTxt(name, release), TEXT_TYPE);119	});120	// §22.1: the newest file for that platform, from the newest release that has one.121	app.get("/:repo/releases/latest/:platform", (c) => {122		const name = c.req.param("repo");123		const f = feed(name);124		if (!f) return send(c, 404, REPO_NOT_FOUND);125		const platform = c.req.param("platform");126		for (const release of f.releases) {127			const file = release.files.find((x) => x.platform === platform);128			if (file) return download(c, name, release.version, file);129		}130		return send(c, 404, RELEASE_NOT_FOUND);131	});132	app.get("/:repo/releases/:version/:platform", (c) => {133		const version = c.req.param("version");134		if (!isVersion(version)) return send(c, 404, RELEASE_NOT_FOUND);135		return downloadAt(c, c.req.param("repo"), version, c.req.param("platform"));136	});137	// Only for a repo with a release, since the script would have nothing to install.138	app.get("/:repo/install.sh", (c) => {139		const name = c.req.param("repo");140		const release = newest(c, name);141		if (release instanceof Response) return release;142		const script = INSTALL_SH.replaceAll("@REPO@", name).replaceAll(143			"@BASE@",144			`https://${ctx.domain}/${name}`,145		);146		c.header("Cache-Control", "public, max-age=60");147		return send(c, 200, script, TEXT_TYPE);148	});149	app.get("/:repo/update-info", (c) => {150		const name = c.req.param("repo");151		const f = feed(name);152		if (!f) return send(c, 404, REPO_NOT_FOUND);153		// §22.4: head is the newest save on the line, a checkpoint included. Its version is the154		// release built from it, else its ID, as in Kepr 2.155		const id = headId(f.repo.mirror);156		const save = id ? saveByPrefix(f.repo.mirror, id) : null;157		const saveHead = save && {158			id: save.id,159			version: f.releases.find((r) => r.save === save.id)?.version ?? save.id,160			createdAt: save.created_at,161		};162		return send(c, 200, updateInfoJson(ctx.domain, name, saveHead ?? null, f.releases[0]));163	});164	app.get("/:repo/meta", (c) => {165		const f = feed(c.req.param("repo"));166		if (!f) return send(c, 404, REPO_NOT_FOUND);167		const { name, category } = f.repo.settings;168		const stats = repoStats(f.repo.mirror);169		const meta = {170			repo: name,171			saveCount: stats.saves,172			lineCount: stats.lines,173			lastSaveAt: stats.updated ?? 0,174			latestRelease: f.releases[0]?.version ?? null,175			description: readmeIntro(name, readmeAtHead(f.repo))?.text ?? null,176			language: stats.language || null,177			category: category || null,178		};179		return send(c, 200, metaJson(meta));180	});181}