Align live captions transport to flat language payloads

routes/liveCaptions.js

@@ -6,6 +6,7 @@ const sessionChecker = require("../middleware/sessionChecker.js");
 const MAX_BUFFER_SIZE = 300;
 const DEFAULT_INITIAL_LIMIT = 40;
 const MAX_INITIAL_LIMIT = 120;
+const CAPTION_META_KEYS = new Set(["sequence", "createdAt", "original"]);
 
 const liveCaptionState = {
     startedAt: Date.now(),
@@ -32,12 +33,36 @@ const normalizeTranslations = (translations) => {
     return normalized;
 };
 
+const buildTranslationsFromFlatPayload = (payload) => {
+    const ignoredKeys = new Set(["original", "sourceLang", "translations"]);
+    const normalized = {};
+    for (const [key, value] of Object.entries(payload || {})) {
+        if (ignoredKeys.has(key)) continue;
+        const lang = normalizeLang(key);
+        const text = typeof value === "string" ? value.trim() : "";
+        if (!lang || !text) continue;
+        normalized[lang] = text;
+    }
+    return normalized;
+};
+
+const inferSourceLangFromTranslations = (original, translations) => {
+    const normalizedOriginal = String(original || "").trim();
+    if (!normalizedOriginal) return "original";
+    for (const [lang, text] of Object.entries(translations || {})) {
+        if (String(text || "").trim() === normalizedOriginal) return normalizeLang(lang);
+    }
+    return "original";
+};
+
 const getAvailableLanguages = () => {
     const langs = new Set();
     for (const caption of liveCaptionState.captions) {
-        if (caption?.sourceLang) langs.add(caption.sourceLang);
-        const translationMap = caption?.translations || {};
-        Object.keys(translationMap).forEach((lang) => langs.add(normalizeLang(lang)));
+        Object.keys(caption || {}).forEach((key) => {
+            if (CAPTION_META_KEYS.has(key)) return;
+            const lang = normalizeLang(key);
+            if (lang) langs.add(lang);
+        });
     }
     return Array.from(langs).filter(Boolean).sort();
 };
@@ -79,20 +104,24 @@ router.post("/ingest", async (req, res) => {
     try {
         // TODO: Add basic auth/API key validation before production roll-out.
         const original = typeof req.body?.original === "string" ? req.body.original.trim() : "";
-        const sourceLang = normalizeLang(req.body?.sourceLang || "original");
-        const translations = normalizeTranslations(req.body?.translations);
+        const mapFromNested = normalizeTranslations(req.body?.translations);
+        const mapFromFlat = buildTranslationsFromFlatPayload(req.body);
+        const translations = { ...mapFromNested, ...mapFromFlat };
+        const sourceLang = normalizeLang(req.body?.sourceLang || inferSourceLangFromTranslations(original, translations));
 
         if (!original) {
             return res.status(400).json({ status: "Original text is required" });
         }
+        if (sourceLang && sourceLang !== "original" && !translations[sourceLang]) {
+            translations[sourceLang] = original;
+        }
 
         const sequence = liveCaptionState.latestSequence + 1;
         const caption = {
             sequence,
             createdAt: new Date().toISOString(),
-            sourceLang,
             original,
-            translations,
+            ...translations,
         };
 
         liveCaptionState.latestSequence = sequence;

scripts/liveCaptionsTestSender.js

@@ -10,35 +10,27 @@ const intervalMs = 5000;
 const samples = [
     {
         original: "Bienvenidos a nuestro servicio de adoracion.",
-        sourceLang: "es",
-        translations: {
-            en: "Welcome to our worship service.",
-            fr: "Bienvenue a notre service de louange.",
-        },
+        es: "Bienvenidos a nuestro servicio de adoracion.",
+        en: "Welcome to our worship service.",
+        fr: "Bienvenue a notre service de louange.",
     },
     {
         original: "Leamos juntos en el Salmo 23.",
-        sourceLang: "es",
-        translations: {
-            en: "Let us read together in Psalm 23.",
-            fr: "Lisons ensemble le Psaume 23.",
-        },
+        es: "Leamos juntos en el Salmo 23.",
+        en: "Let us read together in Psalm 23.",
+        fr: "Lisons ensemble le Psaume 23.",
     },
     {
         original: "Dios es fiel en todo tiempo.",
-        sourceLang: "es",
-        translations: {
-            en: "God is faithful at all times.",
-            fr: "Dieu est fidele en tout temps.",
-        },
+        es: "Dios es fiel en todo tiempo.",
+        en: "God is faithful at all times.",
+        fr: "Dieu est fidele en tout temps.",
     },
     {
         original: "Tomemos un momento para orar.",
-        sourceLang: "es",
-        translations: {
-            en: "Let us take a moment to pray.",
-            fr: "Prenons un moment pour prier.",
-        },
+        es: "Tomemos un momento para orar.",
+        en: "Let us take a moment to pray.",
+        fr: "Prenons un moment pour prier.",
     },
 ];