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* Translation routes — MERGED endpoint (SHY-0072, operator decision):
*
* POST /api/translate
* • Authenticated (Bearer attached by authMiddleware): the ORIGINAL
* chat-message contract, unchanged — input {text, targetLang,
* messagePath}, per-user daily quota, Firestore message-doc cache,
* response {translatedText, detectedSourceLang, cached}, 502 when no
* provider can translate. Its provider call now goes through the
* unified chain + string cache underneath (engine upgrade, same
* contract — pinned by tests/routes/translate.test.js, which must
* stay green UNCHANGED).
* • Anonymous (no Authorization header — index.js skip-list lets it
* through): the PUBLIC page-content flow — input {texts[], target},
* unified string cache → provider chain (gtx → LibreTranslate) →
* fail-silent English with missed[] + X-Translation-Missed header +
* dedup'd JSONL miss queue. Always 200 for valid input: the public
* page must never break on translation trouble.
* Anonymous CHAT-shaped bodies are rejected 401 (chat requires auth).
*
* GET /api/translate/quota — authenticated, unchanged.
*
* Translated strings are stored/returned RAW — escaping is the
* renderer's job at insertion (SHY-0073).
*/
const express = require('express');
const { db, FieldValue } = require('../utils/firebase');
const log = require('../utils/log');
const { translateOne } = require('../utils/translation-provider');
const { createTranslationCache } = require('../utils/translation-cache');
const { getDefaultMissQueue } = require('../utils/translation-miss-queue');
const { SUPPORTED_LOCALES } = require('../utils/supported-locales');
const router = express.Router();
const FREE_DAILY_LIMIT = 50;
const PUBLIC_MAX_TEXTS = 50;
const PUBLIC_MAX_TEXT_LEN = 2000;
// Unified string cache — engine-level, shared by both caller classes.
// Env overrides exist for test isolation (fresh module per test via
// jest.resetModules binds these singletons to per-test tmp paths).
const stringCache = createTranslationCache({
seedPath: process.env.TRANSLATION_CACHE_SEED_PATH || undefined,
runtimePath: process.env.TRANSLATION_CACHE_RUNTIME_PATH || undefined,
});
const missQueue = getDefaultMissQueue();
/** Chain + string-cache lookup shared by both flows. */
async function translateCached(text, target) {
const cached = stringCache.get(text, target);
if (cached !== null) {
return { ok: true, translated: cached, provider: 'cache', detectedSourceLang: 'unknown' };
}
const result = await translateOne(text, target);
if (result.ok) stringCache.set(text, target, result.translated);
return result;
}
// ─── Anonymous public-content flow ────────────────────────────────
function validatePublicInput(texts, target) {
if (target === 'en') return 'target en is a no-op';
if (!SUPPORTED_LOCALES.includes(target)) return 'Unsupported target locale';
if (!Array.isArray(texts) || texts.length === 0) return 'texts must be a non-empty array';
if (texts.length > PUBLIC_MAX_TEXTS) return `Too many texts (max ${PUBLIC_MAX_TEXTS})`;
for (const t of texts) {
Iif (typeof t !== 'string' || t.length === 0) return 'texts entries must be non-empty strings';
if (t.length > PUBLIC_MAX_TEXT_LEN)
return `Text too long (max ${PUBLIC_MAX_TEXT_LEN} characters)`;
}
return null;
}
async function handlePublicTranslate(req, res) {
const { texts, target } = req.body || {};
const inputError = validatePublicInput(texts, target);
if (inputError) return res.status(400).json({ error: inputError });
const unique = [...new Set(texts)];
const translations = {};
const missed = [];
let firstReason = null;
const results = await Promise.allSettled(unique.map((t) => translateCached(t, target)));
results.forEach((settled, i) => {
const text = unique[i];
const r =
settled.status === 'fulfilled'
? settled.value
: { ok: false, reason: settled.reason?.message };
if (r.ok) {
translations[text] = r.translated;
} else {
// Fail-silent: English text, recorded as missed, queued for backfill.
translations[text] = text;
missed.push(text);
Eif (!firstReason) firstReason = r.reason || 'unknown';
missQueue.enqueue(text, target, r.reason || 'unknown');
}
});
if (missed.length > 0) {
log.warn('translate', 'provider chain failed for some public texts', {
target,
missedCount: missed.length,
reason: firstReason,
});
}
res.set('X-Translation-Missed', String(missed.length));
return res.json({ translations, missed });
}
// ─── Authenticated chat flow (original contract) ──────────────────
/** Validate translate request inputs. Returns error string or null. */
function validateTranslateInput(text, targetLang) {
if (!text || !targetLang) return 'text and targetLang required';
if (!/^[a-z]{2,3}(-[A-Za-z]{2,4})?$/.test(targetLang)) return 'Invalid language code';
if (text.length > 5000) return 'Text too long (max 5000 characters)';
return null;
}
/** Verify the user is a participant of the parent conversation/room. */
async function verifyParticipant(messagePath, uniqueId) {
const parentPath = messagePath.split('/').slice(0, 2).join('/');
const parentSnap = await db.doc(parentPath).get();
if (!parentSnap.exists) return false;
const participantIds = parentSnap.data().participantIds || [];
// participantIds are stored as STRINGS on both conversations (the app +
// firestore.rules) and rooms (room-mutations.js writes String(uniqueId)), but
// req.auth.uniqueId is a NUMBER — coerce both sides, the same pattern
// conversations.js uses, so the cache gate isn't a silent false-negative.
return participantIds.map(String).includes(String(uniqueId));
}
/** Check translation cache on the message doc. */
async function checkTranslationCache(messagePath, targetLang) {
const msgSnap = await db.doc(messagePath).get();
return msgSnap.data()?.translations?.[targetLang] || null;
}
async function handleChatTranslate(req, res) {
const { text, targetLang, messagePath } = req.body;
const uniqueId = req.auth.uniqueId;
const inputError = validateTranslateInput(text, targetLang);
if (inputError) return res.status(400).json({ error: inputError });
const validMessagePath =
messagePath &&
/^(conversations|rooms)\/[a-zA-Z0-9_-]+\/messages\/[a-zA-Z0-9_-]+$/.test(messagePath);
const participantVerified = validMessagePath
? await verifyParticipant(messagePath, uniqueId)
: false;
// Check cache
if (validMessagePath && participantVerified) {
const cached = await checkTranslationCache(messagePath, targetLang);
if (cached) return res.json({ translatedText: cached, cached: true });
}
// Check quota for non-SuperShy users
const userSnap = await db.doc(`users/${uniqueId}`).get();
const userData = userSnap.data() || {};
const isSuperShy = userData.isSuperShy === true;
const today = new Date().toISOString().slice(0, 10);
if (!isSuperShy) {
const translationDate = userData.translationDate || '';
const translationsToday = translationDate === today ? userData.translationsToday || 0 : 0;
if (translationsToday >= FREE_DAILY_LIMIT) {
return res.status(429).json({
error: 'Daily translation limit reached',
limit: FREE_DAILY_LIMIT,
upgradePrompt: true,
});
}
}
// Unified chain + string cache. Full-chain failure keeps the original
// 502 contract for chat callers.
const result = await translateCached(text, targetLang);
if (!result.ok) {
log.error('translate', 'translation provider chain failed', { error: result.reason });
return res.status(502).json({ error: 'Translation service unavailable' });
}
// Cache translation on message doc (only if participant verified)
if (validMessagePath && participantVerified) {
db.doc(messagePath)
.update({ [`translations.${targetLang}`]: result.translated })
.catch((err) =>
log.error('translate', 'Failed to cache translation', {
messagePath,
targetLang,
error: err.message,
}),
);
}
// Increment daily counter (non-SuperShy only)
if (!isSuperShy) {
db.doc(`users/${uniqueId}`)
.update({
translationsToday: userData.translationDate === today ? FieldValue.increment(1) : 1,
translationDate: today,
})
.catch((err) =>
log.error('translate', 'Failed to update translation quota', {
userId: uniqueId,
error: err.message,
}),
);
}
return res.json({
translatedText: result.translated,
detectedSourceLang: result.detectedSourceLang,
cached: false,
});
}
// POST /api/translate — merged entry point
router.post('/translate', async (req, res) => {
try {
if (!req.auth) {
// Anonymous caller. Explicitly chat-shaped bodies ({text/targetLang}
// without texts) are 401 — chat translation requires authentication,
// exactly as before. Everything else is treated as a public-flow
// attempt and gets that flow's 400-grade validation.
const b = req.body || {};
const chatShaped =
b.texts === undefined && (b.text !== undefined || b.targetLang !== undefined);
if (chatShaped) return res.status(401).json({ error: 'Authentication required' });
return await handlePublicTranslate(req, res);
}
return await handleChatTranslate(req, res);
} catch (err) {
log.error('translate', 'Translation request failed', { error: err.message });
return res.status(500).json({ error: 'Translation failed' });
}
});
// GET /api/translate/quota
router.get('/translate/quota', async (req, res) => {
try {
const uniqueId = req.auth.uniqueId;
const userSnap = await db.doc(`users/${uniqueId}`).get();
const userData = userSnap.data() || {};
const isSuperShy = userData.isSuperShy === true;
const today = new Date().toISOString().slice(0, 10);
const translationsToday =
userData.translationDate === today ? userData.translationsToday || 0 : 0;
res.json({
used: translationsToday,
limit: isSuperShy ? -1 : FREE_DAILY_LIMIT,
unlimited: isSuperShy,
});
} catch (err) {
log.error('translate', 'Failed to check translation quota', {
userId: req.auth.uniqueId,
error: err.message,
});
res.status(500).json({ error: 'Failed to check quota' });
}
});
module.exports = router;
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