/**
* The built page, off disk. Vite compiles src/tools/control-room/ui into
* ui/dist; this serves it, and says so plainly when the build has not been run
* rather than answering a blank page.
*/
import { spawnSync } from "node:child_process";
import { existsSync } from "node:fs";
import { isAbsolute, relative, resolve } from "node:path";
const UI_DIST = resolve(import.meta.dir, "ui", "dist");
export const BUILD_COMMAND = "bun run build:ui";
export function isBuilt(): boolean {
return existsSync(resolve(UI_DIST, "index.html"));
}
/**
* A clone has vite; a published install has the prepacked dist and never needs
* it. Either way the page is there by the time the server answers.
*/
export function buildPage(): boolean {
const repoRoot = resolve(import.meta.dir, "..", "..", "..");
// node_modules/.bin/vite is a shell shim that Windows cannot spawn directly;
// the package's own JS entry runs the same build under any runtime.
const vite = resolve(repoRoot, "node_modules", "vite", "bin", "vite.js");
if (!existsSync(vite)) return false;
const built = spawnSync(process.execPath, [vite, "build"], {
cwd: resolve(import.meta.dir, "ui"),
encoding: "utf-8",
});
return built.status === 0 && isBuilt();
}
function unbuiltPage(): Response {
return new Response(
`PAL control room` +
`` +
`The page has not been built
` +
`The control room's assets are a build artifact rather than source. Run:
` +
`${BUILD_COMMAND}`,
{ status: 503, headers: { "content-type": "text/html; charset=utf-8" } }
);
}
export function indexHtml(): Response {
if (!isBuilt()) return unbuiltPage();
return new Response(Bun.file(resolve(UI_DIST, "index.html")), {
headers: { "content-type": "text/html; charset=utf-8" },
});
}
/**
* Only what the build emitted, resolved inside dist — a request that climbs out
* of it with `..` is a miss, not a file read.
*/
export function staticAsset(pathname: string): Response | null {
const target = resolve(UI_DIST, `.${pathname}`);
if (!isInsideDist(target)) return null;
return existsSync(target) ? new Response(Bun.file(target)) : null;
}
/** Compared as paths, not strings — a separator differs by platform. */
function isInsideDist(target: string): boolean {
const rel = relative(UI_DIST, target);
return rel !== "" && !rel.startsWith("..") && !isAbsolute(rel);
}