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The finished-game export (GCG + a new PNG of the final position) is one signed, short-lived relative URL (game.export_url; HMAC-SHA256, 10-min TTL, BACKEND_EXPORT_SIGN_KEY) resolved against the client's own origin and delivered by the best affordance each platform has (five on-device review rounds): - TG Android/desktop: native showPopup chooser -> native downloadFile dialog (bridge-only chain, activation-safe). - TG iOS: app-modal chooser -> OS share sheet with the fetched file (a popup callback cannot supply the activation the sheet needs). - VK iOS: VKWebAppDownloadFile for both formats. - VK Android: the PNG opens in VK's native image viewer, the GCG copies to the clipboard (the VK Android downloader hangs on any download, Content-Length/Range notwithstanding). - VK desktop iframe / desktop browsers: plain anchor downloads. - Mobile browsers: the OS share sheet (fetch-then-share). - Legacy TG (< Bot API 8.0): app modal + GCG clipboard, no image option. The PNG is rasterized on demand by the new internal `renderer` sidecar (node:22-slim + skia-canvas + baked Liberation/Noto Color Emoji fonts) executing the SAME ui/src/lib/gameimage.ts the ui project unit-tests; the backend rebuilds the render payload from the journal + engine.AlphabetTable, and the device date locale, IANA time zone and localized non-play labels ride the signed URL. Nothing is stored — the artifact re-derives from the immutable journal on each GET. The gateway forwards /dl/* (caddy @gateway matcher extended) behind the per-IP public rate limiter and serves bytes via http.ServeContent. Deploy: renderer service in compose + prod overlay + rolling order + prod push list; TEST_/PROD_EXPORT_SIGN_KEY secrets; the sidecar smoke runs in the ui CI job. Docs: ARCHITECTURE, FUNCTIONAL(+_ru), UI_DESIGN, TESTING, deploy/README, renderer/README.
56 lines
2.1 KiB
JavaScript
56 lines
2.1 KiB
JavaScript
// The render sidecar: a minimal internal HTTP service the backend calls to rasterize the
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// finished-game export image. It runs the same drawGameImage the browser build ships
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// (bundled from ui/src/lib at image build time) on skia-canvas, with system fonts from
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// the image (Liberation Sans + Noto Color Emoji via fontconfig).
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//
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// POST /render {game, moves, alphabet, labels, dateLocale, hostname, scale?} → image/png
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// GET /healthz → 200
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//
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// The service is internal-only (docker network `internal`); authentication, participant
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// checks and the signed public URL all live in the backend — this process only draws.
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import { createServer } from 'node:http';
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import { renderRequest } from './render.mjs';
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const PORT = Number(process.env.RENDERER_PORT || 8090);
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// A render request is a finished game's journal — generously capped.
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const MAX_BODY = 2 * 1024 * 1024;
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function readBody(req) {
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return new Promise((resolve, reject) => {
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const chunks = [];
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let size = 0;
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req.on('data', (c) => {
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size += c.length;
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if (size > MAX_BODY) {
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reject(Object.assign(new Error('body too large'), { status: 413 }));
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req.destroy();
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return;
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}
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chunks.push(c);
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});
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req.on('end', () => resolve(Buffer.concat(chunks)));
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req.on('error', reject);
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});
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}
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const server = createServer(async (req, res) => {
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try {
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if (req.method === 'GET' && req.url === '/healthz') {
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res.writeHead(200, { 'content-type': 'text/plain' }).end('ok');
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return;
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}
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if (req.method === 'POST' && req.url === '/render') {
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const png = await renderRequest(JSON.parse(await readBody(req)));
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res.writeHead(200, { 'content-type': 'image/png', 'content-length': png.length }).end(png);
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return;
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}
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res.writeHead(404).end();
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} catch (err) {
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const status = err.status || (err instanceof SyntaxError ? 400 : 500);
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console.error(`render error: ${err.message}`);
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res.writeHead(status, { 'content-type': 'text/plain' }).end('render failed');
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}
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});
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server.listen(PORT, () => console.log(`renderer listening on :${PORT}`));
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