runicgateway.com/astro.config.mjs

// @ts-check
import { defineConfig } from 'astro/config';
import node from '@astrojs/node';
import starlight from '@astrojs/starlight';

import { inlineScriptHashes, inlineStyleHashes } from './src/config/cspHashes.mjs';
import { docsSidebar } from './src/config/sidebar.mjs';

/**
 * PLAN.md §6 calls this "Astro with the Node adapter, `output: 'server'` with per-page
 * `prerender = true`". Astro 7 expresses that shape the other way round: `output: 'static'`
 * with an adapter prerenders everything and lets individual routes opt OUT with
 * `export const prerender = false`. The runtime result is identical to what §6 describes —
 * a container serving prerendered HTML, with a handful of routes executing per request —
 * and this is the direction the framework supports, so the default is the safe one: a page
 * added without thinking about it is static, not accidentally server-rendered.
 *
 * The two routes that will opt out live in phases 2 and 5: `GET /brand/*` (§7) and
 * `POST /api/beta-signup` (§8).
 */
export default defineConfig({
  site: 'https://runicgateway.com',
  output: 'static',
  // `staticHeaders` is what turns §6's CSP from a promise into a response header (D48).
  // Without it the policy ships as a `<meta http-equiv>`, and a meta CSP silently ignores
  // `frame-ancestors` — the one directive that stops the site being framed. With it, the
  // build writes `_headers.json` next to the server entry and the standalone server sends
  // the policy as a real header on every prerendered route, so the operator's reverse proxy
  // needs no CSP configuration at all and cannot get it wrong.
  adapter: node({ mode: 'standalone', staticHeaders: true }),

  build: {
    // Directory-style URLs, so every link in prose can end in a slash and mean it.
    format: 'directory',
  },

  security: {
    csp: {
      directives: [
        // The whole posture in one line: nothing loads from anywhere but this origin.
        // §6 could promise this without exceptions because the fonts are self-hosted and
        // D9 rules out analytics — there is no CDN to whitelist and no beacon to allow.
        "default-src 'self'",
        // Not covered by `default-src`, and each one closes a specific door: no injected
        // `<base>` can re-point every relative URL on the page, the signup form can only
        // post to us, no plugin content at all, and the site cannot be framed. The last
        // of those is the reason `staticHeaders` is on.
        "base-uri 'self'",
        "form-action 'self'",
        "object-src 'none'",
        "frame-ancestors 'none'",
        // One `url(data:image/svg+xml)` survives bundling into the stylesheet. Data URLs
        // are a real (if small) exfiltration-free risk surface, so this is the only
        // relaxation of `default-src` on the image directive and it is scoped to images.
        "img-src 'self' data:",
      ],
      scriptDirective: {
        resources: [
          "'self'",
          // Pagefind (D47) compiles its index with `WebAssembly.instantiate`, which a
          // strict `script-src` blocks outright — search silently returns nothing. This
          // permits WASM compilation *only*; it does not restore `eval`.
          "'wasm-unsafe-eval'",
        ],
        // Starlight's own `is:inline` scripts, which Astro does not hash because it never
        // parses them. Generated — see src/config/cspHashes.mjs and `npm run check:csp`.
        hashes: inlineScriptHashes,
      },
      styleDirective: {
        // No `'self'` here, though `style-src` needs it and gets it: Astro's default
        // already supplies it, and naming it alongside an `attribute`-kind resource makes
        // the build warn — browsers do not fall back from `style-src-attr` to `style-src`,
        // so a `'self'` written here would apply to neither scope the author meant.
        resources: [
          // Starlight and Expressive Code write ~3,700 inline `style` attributes into the
          // documentation — icon sizing, the theme select's width, and every syntax
          // colour, which Expressive Code emits as custom properties on the element. They
          // cannot be hashed (CSP hashes cover `<style>` elements, never attributes), and
          // Astro's own docs record Shiki as incompatible with CSP for exactly this
          // reason. Scoped to `style-src-attr` deliberately: a style attribute cannot
          // execute script, so this leaves the directive CSP exists for — `script-src` —
          // untouched. The marketing pages emit zero inline style attributes.
          { resource: "'unsafe-inline'", kind: 'attribute' },
        ],
        hashes: inlineStyleHashes,
      },
    },
  },

  integrations: [
    starlight({
      title: 'Runic Gateway',
      // Marketing owns the 404 (§10); a Starlight-chrome 404 on `/features/` would be wrong.
      disable404Route: true,
      // Not a file in `public/`: the brand route derives this from whichever `logo.png` is
      // mounted (§7), so the docs' tab icon changes with a rebrand like everything else.
      // Starlight's default is `/favicon.svg`, which does not exist here — every docs page
      // was requesting a 404 for it.
      favicon: '/brand/favicon.ico',
      // Starlight's own light/dark switch is deliberate: §11 keeps marketing single-theme
      // but has the docs honour the reader's preference.
      customCss: ['./src/styles/tokens.css', './src/styles/starlight.css'],
      components: {
        // Not the `logo` option: that takes an asset imported through Vite, which
        // fingerprints the filename into the build — and a fingerprinted logo is one the
        // bind mount can never replace (§7). The override points at the stable
        // `/brand/*` URL instead.
        SiteTitle: './src/components/DocsSiteTitle.astro',
        // Starlight builds its own head, so the docs otherwise miss the brand stylesheet,
        // the manifest and the OG card entirely. See the component.
        Head: './src/components/DocsHead.astro',
      },
      credits: false,
      sidebar: docsSidebar,
      pagination: true,
      lastUpdated: false,
      editLink: {
        baseUrl: 'https://gitea.whitlocktech.com/RunicGateway/runicgateway.com/_edit/main/',
      },
    }),
  ],

  prefetch: {
    prefetchAll: true,
    defaultStrategy: 'hover',
  },
});