freezmo/app/api/grade/route.ts
Martin Dvorak 618ad5fb9c Add an English/Czech interface language switch
English stays the default; Czech is a full translation. Only the app chrome
is translated - notes and generated decks keep their own language, which is a
core feature, not a setting.

i18n
- lib/i18n-dict.ts: flat en/cs dictionaries (441 keys each), translate() and
  translatePlural() with real Czech plural rules (1 sada / 2-4 sady / 5+ sad).
  English is the default and the fallback for a missing key.
- lib/i18n.ts: browser store (freezmo.locale.v1), useI18n() hook, and the
  x-freezmo-locale header. The hook's t/plural are bound to the locale React
  is rendering with, so the first client render matches the server HTML and
  then re-renders in the stored language; module-level t is only for event
  handlers and non-React helpers.
- <html lang> follows the choice (inline script + setLocale).

UI
- Settings -> Language segmented control (English / Cestina), plus an EN/CS
  button on the key gate for first run.
- Every screen translated: sidebar, header, tab bar, library, deck cards,
  folder bar, create flow, all seven activities, study chrome, results,
  settings + health panel, API-key gate and help, install sheet, offline and
  the deck-not-found page.
- Plural-aware counts everywhere (decks, folders, activities, runs, photos,
  documents, pages, words, wrong attempts).

Server
- API routes and guards (generate, grade, health, http-guard, rate-limit,
  ollama error mapping) answer in the request's language, so error cards and
  the health panel never fall back to English mid-sentence.

Fixes
- A hydration mismatch when a non-default locale was stored silently dropped
  the .dark class after hydration; render-time t() is now bound to the
  hook's locale (UploadScreen.describeExtraction, ResultsScreen.answerFor,
  DeckCard's folder fallback).
- Bumped the service worker cache to freezmo-v4 for this deploy.

Tests: i18n 27/27 (gate toggle, persistence, html lang, Czech plurals,
settings switch) and a rebuilt regression suite 72/72 (English default,
library, create, all 7 activity types, results, settings, install sheet,
offline, PWA, security, Czech smoke).
2026-10-08 13:56:32 +00:00

76 lines
2.6 KiB
TypeScript

import { z } from "zod";
import { gradeShortAnswer } from "@/lib/ai";
import { authErrorMessage, authErrorKind, getServerConfig, resolveAuth } from "@/lib/config";
import { friendlyErrorMessage, OllamaError } from "@/lib/ollama";
import { rejectCrossOrigin, rejectOversizedBody, requestLocale } from "@/lib/http-guard";
import { clientKey, rateLimit, rateLimitResponse } from "@/lib/rate-limit";
import { translate } from "@/lib/i18n-dict";
export const runtime = "nodejs";
export const dynamic = "force-dynamic";
const requestSchema = z.object({
question: z.string().min(1).max(1000),
referenceAnswer: z.string().min(1).max(2000),
keyPoints: z.array(z.string().max(300)).max(8).default([]),
userAnswer: z.string().min(1).max(2000),
/** Language of the deck so feedback comes back in the same language. */
language: z.string().max(60).optional(),
});
/** Generous but finite: ~16 compressed images plus JSON overhead. */
const MAX_BODY_BYTES = 65536;
export async function POST(request: Request) {
const locale = requestLocale(request);
const crossOrigin = rejectCrossOrigin(request);
if (crossOrigin) return crossOrigin;
const oversized = rejectOversizedBody(request, MAX_BODY_BYTES);
if (oversized) return oversized;
const config = getServerConfig();
const limit = rateLimit(`grade:${clientKey(request)}`, config.rateLimits.grade, config.rateLimits.windowMs);
if (!limit.allowed) return rateLimitResponse(limit, locale);
const auth = resolveAuth(config, request);
if ("error" in auth) {
return Response.json(
{ error: authErrorMessage(locale, auth.error), kind: authErrorKind(auth.error) },
{ status: 401 },
);
}
let payload: unknown;
try {
payload = await request.json();
} catch {
return Response.json({ error: translate(locale, "server.bodyNotJson") }, { status: 400 });
}
const parsed = requestSchema.safeParse(payload);
if (!parsed.success) {
return Response.json({ error: translate(locale, "server.invalidGrade") }, { status: 400 });
}
try {
const result = await gradeShortAnswer({
model: config.textModel,
auth: auth.auth,
...parsed.data,
// Grading is quick; don't let a hung request block the feed for minutes.
signal: AbortSignal.timeout(Math.min(config.timeoutMs, 120_000)),
});
return Response.json(result);
} catch (error) {
console.error("[api/grade]", error instanceof OllamaError ? `${error.kind}: ${error.message}` : error);
return Response.json(
{
error: friendlyErrorMessage(error, auth.auth.baseUrl, locale),
kind: error instanceof OllamaError ? error.kind : "unknown",
},
{ status: 502 },
);
}
}