Align live captions transport to flat language payloads

Reviewed-on: http://192.168.68.119:3000/adolforeyna/EMI-Backend/pulls/4

auth/authEmail.js

@@ -3,7 +3,7 @@ const { client_logger } = require('../utils/analyticsLogger');
 const bcrypt = require('bcrypt');
 const crypto = require('crypto');
 const { getSessionId, getUserId, getProfileId } = require('../utils/sessionUtils.js');
-const { cookiesOptions } = require('../config/cookiesOptions');
+const { getCookiesOptions } = require('../config/cookiesOptions');
 const Notifications = require("../notifications");
 
 // Object Definitions
@@ -19,6 +19,7 @@ const createPasswordTokenHash = (rawToken) =>
 
 const createSessionFromUser = async ({ DB, user, req, res }) => {
     const sessionObj = await DB.newSession(user._id);
+    const cookiesOptions = getCookiesOptions(req);
     res.cookie('user_sid', user._id, cookiesOptions);
     res.cookie('session_id', sessionObj.insertedId, cookiesOptions);
     const latestUpdatedProfile = await DB.latestProfile(user._id);
@@ -143,8 +144,9 @@ const logout = async function (req, res) {
     const session_id = getSessionId(req);
     const user_sid = getUserId(req);
     if (session_id && user_sid) {
-        res.clearCookie('session_id');
-        res.clearCookie('user_sid');
+        const cookiesOptions = getCookiesOptions(req);
+        res.clearCookie('session_id', cookiesOptions);
+        res.clearCookie('user_sid', cookiesOptions);
         //remove from DB
         const DB = await MongoDB.getDB;
         DB.removeSession(session_id);

config/cookiesOptions.js

@@ -1,12 +1,49 @@
 const isProduction = process.env.NODE_ENV === "production";
 const forceSecureCookie = process.env.COOKIE_SECURE === "true";
-const secure = forceSecureCookie || isProduction;
 
-const cookiesOptions = {
-    maxAge: 1000 * 60 * 60 * 24 * 90, // would expire after 90 days
-    httpOnly: true, // The cookie only accessible by the web server
-    sameSite: secure ? 'none' : 'lax',
-    secure,
+const COOKIE_MAX_AGE_MS = 1000 * 60 * 60 * 24 * 90; // 90 days
+const LOCAL_ORIGIN_REGEX = /^http:\/\/(localhost|127\.0\.0\.1|aeropi\.local)(:\d+)?$/i;
+const LOCAL_HOST_REGEX = /^(localhost|127\.0\.0\.1|aeropi\.local)(:\d+)?$/i;
+
+const getHeaderValue = (req, key) => {
+    if (!req || !req.headers) return "";
+    const raw = req.headers[key];
+    if (Array.isArray(raw)) return raw[0] || "";
+    return raw || "";
 };
 
-module.exports = { cookiesOptions };
+const isLocalRequest = (req) => {
+    const origin = getHeaderValue(req, "origin");
+    const host = getHeaderValue(req, "host");
+    return LOCAL_ORIGIN_REGEX.test(origin) || LOCAL_HOST_REGEX.test(host);
+};
+
+const isHttpsRequest = (req) => {
+    if (!req) return false;
+    const forwardedProto = String(getHeaderValue(req, "x-forwarded-proto")).split(",")[0].trim().toLowerCase();
+    const reqProtocol = String(req.protocol || "").toLowerCase();
+    const origin = String(getHeaderValue(req, "origin") || "").toLowerCase();
+    if (forwardedProto === "https" || reqProtocol === "https") return true;
+    return origin.startsWith("https://");
+};
+
+const shouldUseSecureCookie = (req) => {
+    if (forceSecureCookie) return true;
+    if (isLocalRequest(req)) return false;
+    if (isHttpsRequest(req)) return true;
+    return isProduction;
+};
+
+const getCookiesOptions = (req) => {
+    const secure = shouldUseSecureCookie(req);
+    return {
+        maxAge: COOKIE_MAX_AGE_MS,
+        httpOnly: true,
+        sameSite: secure ? "none" : "lax",
+        secure,
+    };
+};
+
+const cookiesOptions = getCookiesOptions();
+
+module.exports = { cookiesOptions, getCookiesOptions };

config/corsOptions.js

@@ -7,6 +7,7 @@ var corsOptions = {
         'http://127.0.0.1:8081',
         'http://localhost:3000', 
         "https://social.emmint.com",  
+        "https://www.social.emmint.com",
         "https://fellowship.emmint.com",
         "https://aeropi.local",
     ],

dbTools/chat.js

@@ -0,0 +1,69 @@
+const DBName = "EMI_SOCIAL";
+
+const chatDB = (DB) => {
+    DB.chatMessagesCol = DB.db.db(DBName).collection("chat_messages");
+    DB.chatMessagesCol.createIndex({ createdAt: -1 }).catch(console.error);
+
+    DB.addChatMessage = async ({ senderId, senderProfileId, senderName, text, sourceLang }) => {
+        const safeText = (text || "").trim();
+        if (!safeText) return false;
+        const message = {
+            senderId: senderId ? senderId + "" : "",
+            senderProfileId: senderProfileId ? senderProfileId + "" : "",
+            senderName: senderName || "Anonymous",
+            text: safeText,
+            sourceLang: sourceLang || "en",
+            translations: {},
+            createdAt: new Date(),
+        };
+        const result = await DB.chatMessagesCol.insertOne(message).catch((err) => {
+            console.log(err);
+            return false;
+        });
+        if (!result || !result.insertedId) return false;
+        return {
+            ...message,
+            _id: result.insertedId,
+        };
+    };
+
+    DB.getChatParticipants = async () => {
+        return DB.chatMessagesCol.distinct("senderProfileId").catch((err) => {
+            console.log(err);
+            return [];
+        });
+    };
+
+    DB.getRecentChatMessages = async (limit = 100) => {
+        const safeLimit = Math.min(Math.max(parseInt(limit, 10) || 100, 1), 200);
+        const messages = await DB.chatMessagesCol.find({})
+            .sort({ createdAt: -1 })
+            .limit(safeLimit)
+            .toArray()
+            .catch((err) => {
+                console.log(err);
+                return [];
+            });
+        return messages.reverse();
+    };
+
+    DB.setChatMessageTranslation = async ({ messageId, targetLang, text, provider, model }) => {
+        if (!messageId || !targetLang || !text) return false;
+        const _id = typeof messageId === "string" ? DB.ObjectID(messageId) : messageId;
+        const fieldBase = `translations.${targetLang}`;
+        const update = {
+            $set: {
+                [`${fieldBase}.text`]: text,
+                [`${fieldBase}.provider`]: provider || "openai",
+                [`${fieldBase}.model`]: model || "",
+                [`${fieldBase}.updatedAt`]: new Date(),
+            },
+        };
+        return DB.chatMessagesCol.updateOne({ _id }, update).catch((err) => {
+            console.log(err);
+            return false;
+        });
+    };
+};
+
+module.exports = chatDB;

dbTools/post.js

@@ -38,6 +38,20 @@ postDB = (DB)=>{
         });
     }
 
+    DB.addTranslation = (postid, lang, translatedText) => {
+        if(!DB.ObjectID.isValid(postid)) return false;
+        const id = DB.ObjectID(postid);
+        let update = {
+            $set:{
+                ["translations." + lang]: translatedText
+            }
+        }
+        return DB.postCols.updateOne({_id: id}, update).catch((err)=>{
+            console.log(err);
+            return false;
+        });
+    }
+
     DB.newReaction = (postid, profileid, reaction) => {
         if(!DB.ObjectID.isValid(postid)) return false;
         const id = DB.ObjectID(postid);

index.js

@@ -183,6 +183,8 @@ const postRoute = require('./routes/post.js');
 const songsRoute = require('./routes/songs.js');
 const paymentsRoute = require('./routes/payments.js');
 const bibleRoute = require('./routes/bible.js');
+const chatRoute = require('./routes/chat.js');
+const liveCaptionsRoute = require('./routes/liveCaptions.js');
 const sessionChecker = require('./middleware/sessionChecker');
 // -- Private Routes
 app.use('/user', sessionChecker, profileRoute);
@@ -190,6 +192,8 @@ app.use('/post', sessionChecker, postRoute);
 app.use('/payments', paymentsRoute);
 app.use('/bible', sessionChecker, bibleRoute);
 app.use('/songs', sessionChecker, songsRoute);
+app.use('/chat', sessionChecker, chatRoute);
+app.use('/live-captions', liveCaptionsRoute);
 // -- Public Routes
 const subsplashRoute = require('./routes/subsplash.js');
 app.use('/subsplash', subsplashRoute);
@@ -238,7 +242,7 @@ const webPushEmail = process.env.WEB_PUSH_EMAIL;
 webPush.setVapidDetails('mailto:' + webPushEmail, publicVapidKey, privateVapidKey);
 
 
-const { cookiesOptions } = require('./config/cookiesOptions');
+const { getCookiesOptions } = require('./config/cookiesOptions');
 const { client_logger } = require('./utils/analyticsLogger.js');
 const { getSessionId, getUserId, getProfileId } = require('./utils/sessionUtils.js');
 
@@ -408,7 +412,7 @@ DB.getDB.then((DB) => {
                 return res.status(403).json({ status: "Profile does not belong to the logged-in user" });
             }
             // Update active profile cookie
-            res.cookie('profile_id', profile._id, cookiesOptions);
+            res.cookie('profile_id', profile._id, getCookiesOptions(req));
             return res.json({ status: "ok", profile });
         } catch (error) {
             console.error("Error changing profile:", error);

middleware/sessionChecker.js

@@ -1,9 +1,22 @@
 const { getSessionId, getUserId, getProfileId } = require('../utils/sessionUtils');
 const { client_logger } = require('../utils/analyticsLogger');
-const { cookiesOptions } = require('../config/cookiesOptions');
+const { getCookiesOptions } = require('../config/cookiesOptions');
 const MongoDB = require("../mongoDB.js");
 const { ObjectId } = require("mongodb");
 
+const shouldReturnJson = (req) => {
+    const accept = String(req?.headers?.accept || "").toLowerCase();
+    const contentType = String(req?.headers?.["content-type"] || "").toLowerCase();
+    return !!req?.headers?.origin || accept.includes("application/json") || contentType.includes("application/json");
+};
+
+const rejectUnauthorized = (req, res) => {
+    if (shouldReturnJson(req)) {
+        return res.status(401).json({ status: "Unauthorized" });
+    }
+    return res.redirect('/login');
+};
+
 const sessionChecker = async (req, res, next) => {
     try {
         const session_id = getSessionId(req);
@@ -11,10 +24,10 @@ const sessionChecker = async (req, res, next) => {
         let profile_id = getProfileId(req);
 
         if (!session_id || !user_sid) {
-            return res.redirect('/login');
+            return rejectUnauthorized(req, res);
         }
         if (!ObjectId.isValid(session_id) || !ObjectId.isValid(user_sid)) {
-            return res.redirect('/login');
+            return rejectUnauthorized(req, res);
         }
 
         const DB = await MongoDB.getDB;
@@ -24,15 +37,15 @@ const sessionChecker = async (req, res, next) => {
         if (!await DB.getProfileCache(profile_id)) {
             const latestProfile = await DB.latestProfile(user_sid);
             if (!latestProfile || !latestProfile._id) {
-                return res.redirect('/login');
+                return rejectUnauthorized(req, res);
             }
-            res.cookie('profile_id', latestProfile._id, cookiesOptions);
+            res.cookie('profile_id', latestProfile._id, getCookiesOptions(req));
             profile_id = latestProfile._id;
         }
 
         req.profileInfo = { _id: profile_id };
 
-        if (!userInfo) return res.redirect('/login');
+        if (!userInfo) return rejectUnauthorized(req, res);
 
         client_logger.capture({
             distinctId: user_sid,
@@ -42,7 +55,7 @@ const sessionChecker = async (req, res, next) => {
         next();
     } catch (error) {
         console.error("Session checker error", error);
-        return res.redirect('/login');
+        return rejectUnauthorized(req, res);
     }
 };
 

mongoDB.js

@@ -9,6 +9,7 @@ const postDB = require("./dbTools/post.js");
 const profileDB = require("./dbTools/profile.js");
 const paymentDB = require("./dbTools/payments.js");
 const songsDB = require("./dbTools/songs.js");
+const chatDB = require("./dbTools/chat.js");
 
 console.log("Connecting to MongoDB...");
 const nodeMajorVersion = parseInt((process.versions.node || "0").split(".")[0], 10);
@@ -177,6 +178,7 @@ const getDB = new Promise((resolve, reject) => {
         profileDB(DB);
         paymentDB(DB);
         songsDB(DB);
+        chatDB(DB);
     
         resolve(DB);
     });

notifications.js

@@ -489,6 +489,26 @@ const Notifications = {
     // sendWebNotification(requesterProfile.webSubscription, notifBody);
     DB.addNotification(requesterProfile, notifBody, null, null, groupProfile._id);
   },
+  async youGotANewChatMessage(senderProfileId, messageText) {
+    const DB = await DBGetter.getDB;
+    const participants = await DB.getChatParticipants();
+    const senderProfile = await DB.getProfileCache(senderProfileId);
+    
+    const tokens = [];
+    for (const participantProfileId of participants) {
+      if (participantProfileId.toString() === senderProfileId.toString()) continue;
+      
+      const participantProfile = await DB.getProfileCache(participantProfileId);
+      if (participantProfile && Array.isArray(participantProfile.token)) {
+        tokens.push(...participantProfile.token);
+      }
+    }
+
+    if (tokens.length > 0) {
+      const notifBody = `${senderProfile.profile.firstName}: ${messageText.substring(0, 100)}${messageText.length > 100 ? '...' : ''}`;
+      sendPushNotification(tokens, notifBody, { type: 'chat' });
+    }
+  },
   
 }
 

package.json

@@ -6,6 +6,7 @@
   "scripts": {
     "test": "npx mocha test/auth.test.js",
     "start": "node index.js",
+    "live-captions:test-sender": "node scripts/liveCaptionsTestSender.js",
     "docker": "docker compose up -d",
     "docker_restore": "docker-compose exec mongo mongorestore --db EMI_SOCIAL /dump/EMI_SOCIAL/",
     "docker_dump": "docker-compose exec mongo mongodump --uri ${MONGO_URL} --out /dump"

routes/bible.js

@@ -148,7 +148,8 @@ DB.getDB.then((DB) => {
     router.get("/chapters/:chapterId", async (req, res) => {
         const chapterId = req.params.chapterId;
         const bibleId = req.query.bibleId || defaultBibleId;
-        const bibles = await fetchAPI('bibles/' + bibleId + "/chapters/" + chapterId);
+        const contentType = req.query['content-type'] ? `?content-type=${req.query['content-type']}` : '';
+        const bibles = await fetchAPI('bibles/' + bibleId + "/chapters/" + chapterId + contentType);
         return res.json(bibles);
     });
 

routes/chat.js

@@ -0,0 +1,241 @@
+var express = require('express');
+var router = express.Router();
+
+const DB = require("../mongoDB.js");
+const Notifications = require("../notifications.js");
+const { getUserId, getProfileId } = require("../utils/sessionUtils.js");
+const { normalizeLanguageCode, translateText } = require("../utils/chatTranslation.js");
+
+const ACTIVE_WINDOW_MS = 120000;
+const MESSAGE_MAX_LENGTH = 500;
+const activeUsers = new Map();
+const translationInflight = new Map();
+
+const toDisplayName = (profile, fallbackName) => {
+    const firstName = profile?.profile?.firstName || "";
+    const lastName = profile?.profile?.lastName || "";
+    const displayName = (firstName + " " + lastName).trim();
+    return displayName || fallbackName || "Anonymous";
+};
+
+const pruneActiveUsers = () => {
+    const now = Date.now();
+    for (const [profileId, entry] of activeUsers.entries()) {
+        if (now - entry.lastSeen > ACTIVE_WINDOW_MS) {
+            activeUsers.delete(profileId);
+        }
+    }
+};
+
+const getActiveUsersList = () => {
+    pruneActiveUsers();
+    return Array.from(activeUsers.values())
+        .sort((a, b) => b.lastSeen - a.lastSeen)
+        .map((entry) => ({
+            profileId: entry.profileId,
+            userId: entry.userId,
+            displayName: entry.displayName,
+            lastSeen: entry.lastSeen,
+        }));
+};
+
+DB.getDB.then((DB) => {
+    const resolveTargetLanguage = (req) => {
+        const requested = req.query?.lang || req.headers["x-app-language"] || req.headers["accept-language"] || "en";
+        return normalizeLanguageCode(requested);
+    };
+
+    const mapChatMessageForLanguage = async (message, targetLang) => {
+        const normalizedTarget = normalizeLanguageCode(targetLang);
+        const sourceLang = normalizeLanguageCode(message?.sourceLang || "auto");
+        const originalText = message?.text || "";
+
+        if (!originalText) {
+            return {
+                ...message,
+                textOriginal: "",
+                text: "",
+                displayLang: sourceLang,
+            };
+        }
+
+        if (sourceLang === normalizedTarget) {
+            return {
+                ...message,
+                textOriginal: originalText,
+                text: originalText,
+                displayLang: sourceLang,
+            };
+        }
+
+        const cachedTranslation = message?.translations?.[normalizedTarget]?.text;
+        if (cachedTranslation) {
+            return {
+                ...message,
+                textOriginal: originalText,
+                text: cachedTranslation,
+                displayLang: normalizedTarget,
+            };
+        }
+
+        const translationKey = `${message?._id?.toString?.() || ""}:${normalizedTarget}`;
+        if (translationInflight.has(translationKey)) {
+            await translationInflight.get(translationKey);
+            const refreshed = await DB.chatMessagesCol.findOne({ _id: message._id }).catch(() => null);
+            const refreshedCached = refreshed?.translations?.[normalizedTarget]?.text;
+            if (refreshedCached) {
+                return {
+                    ...message,
+                    translations: refreshed.translations,
+                    textOriginal: originalText,
+                    text: refreshedCached,
+                    displayLang: normalizedTarget,
+                };
+            }
+            return {
+                ...message,
+                textOriginal: originalText,
+                text: originalText,
+                displayLang: sourceLang,
+            };
+        }
+
+        const inFlightTask = (async () => {
+            const translated = await translateText({
+                text: originalText,
+                sourceLang,
+                targetLang: normalizedTarget,
+            });
+            if (!translated?.translatedText) return null;
+            await DB.setChatMessageTranslation({
+                messageId: message._id,
+                targetLang: normalizedTarget,
+                text: translated.translatedText,
+                provider: translated.provider,
+                model: translated.model,
+            });
+            return translated.translatedText;
+        })();
+
+        translationInflight.set(translationKey, inFlightTask);
+        let translatedText = null;
+        try {
+            translatedText = await inFlightTask;
+        } finally {
+            translationInflight.delete(translationKey);
+        }
+
+        return {
+            ...message,
+            textOriginal: originalText,
+            text: translatedText || originalText,
+            displayLang: translatedText ? normalizedTarget : sourceLang,
+        };
+    };
+
+    const markActiveUser = async (req) => {
+        const userId = getUserId(req);
+        const profileId = req.profileInfo?._id || getProfileId(req);
+        if (!profileId || !userId) return null;
+        const profile = await DB.getProfileCache(profileId);
+        const displayName = toDisplayName(profile, req.userInfo?.username);
+        activeUsers.set(profileId + "", {
+            profileId: profileId + "",
+            userId: userId + "",
+            displayName,
+            lastSeen: Date.now(),
+        });
+        return activeUsers.get(profileId + "");
+    };
+
+    router.get("/messages", async (req, res) => {
+        try {
+            await markActiveUser(req);
+            const targetLang = resolveTargetLanguage(req);
+            const messages = await DB.getRecentChatMessages(req.query.limit || 100);
+            const translatedMessages = await Promise.all(messages.map((message) => mapChatMessageForLanguage(message, targetLang)));
+            return res.json({
+                status: "ok",
+                requestedLang: targetLang,
+                messages: translatedMessages,
+            });
+        } catch (error) {
+            console.error("Error getting chat messages", error);
+            return res.status(500).json({ status: "Internal server error", messages: [] });
+        }
+    });
+
+    router.post("/messages", async (req, res) => {
+        try {
+            const userId = getUserId(req);
+            const profileId = req.profileInfo?._id || getProfileId(req);
+            const text = typeof req.body?.text === "string" ? req.body.text.trim() : "";
+            const sourceLang = normalizeLanguageCode(req.body?.sourceLang || req.headers["x-app-language"] || "en");
+            if (!text) {
+                return res.status(400).json({ status: "Message text is required" });
+            }
+            if (text.length > MESSAGE_MAX_LENGTH) {
+                return res.status(400).json({ status: `Message too long (${MESSAGE_MAX_LENGTH} max chars)` });
+            }
+
+            const profile = await DB.getProfileCache(profileId);
+            const senderName = toDisplayName(profile, req.userInfo?.username);
+            const message = await DB.addChatMessage({
+                senderId: userId,
+                senderProfileId: profileId,
+                senderName,
+                text,
+                sourceLang,
+            });
+            if (!message) {
+                return res.status(500).json({ status: "Could not save message" });
+            }
+
+            Notifications.youGotANewChatMessage(profileId, text);
+
+            activeUsers.set(profileId + "", {
+                profileId: profileId + "",
+                userId: userId + "",
+                displayName: senderName,
+                lastSeen: Date.now(),
+            });
+
+            return res.json({
+                status: "ok",
+                message,
+                activeUsers: getActiveUsersList(),
+            });
+        } catch (error) {
+            console.error("Error posting chat message", error);
+            return res.status(500).json({ status: "Internal server error" });
+        }
+    });
+
+    router.get("/active", async (req, res) => {
+        try {
+            await markActiveUser(req);
+            return res.json({
+                status: "ok",
+                activeUsers: getActiveUsersList(),
+            });
+        } catch (error) {
+            console.error("Error getting active chat users", error);
+            return res.status(500).json({ status: "Internal server error", activeUsers: [] });
+        }
+    });
+
+    router.post("/ping", async (req, res) => {
+        try {
+            await markActiveUser(req);
+            return res.json({
+                status: "ok",
+                activeUsers: getActiveUsersList(),
+            });
+        } catch (error) {
+            console.error("Error updating chat presence", error);
+            return res.status(500).json({ status: "Internal server error", activeUsers: [] });
+        }
+    });
+});
+
+module.exports = router;

routes/liveCaptions.js

@@ -0,0 +1,158 @@
+var express = require('express');
+var router = express.Router();
+
+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(),
+    latestSequence: 0,
+    captions: [],
+};
+
+const normalizeLang = (lang = "") => {
+    const value = String(lang || "").trim().toLowerCase();
+    if (!value) return "";
+    const base = value.split(",")[0].split("-")[0].trim();
+    return base || value;
+};
+
+const normalizeTranslations = (translations) => {
+    if (!translations || typeof translations !== "object" || Array.isArray(translations)) return {};
+    const normalized = {};
+    for (const [langKey, translatedText] of Object.entries(translations)) {
+        const lang = normalizeLang(langKey);
+        const text = typeof translatedText === "string" ? translatedText.trim() : "";
+        if (!lang || !text) continue;
+        normalized[lang] = text;
+    }
+    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) {
+        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();
+};
+
+router.get("/stream", sessionChecker, async (req, res) => {
+    try {
+        const sinceSequence = Number.parseInt(req.query?.sinceSequence, 10);
+        const requestedLimit = Number.parseInt(req.query?.limit, 10);
+        const initialLimit = Number.isFinite(requestedLimit)
+            ? Math.max(1, Math.min(requestedLimit, MAX_INITIAL_LIMIT))
+            : DEFAULT_INITIAL_LIMIT;
+
+        let captions = [];
+        if (Number.isFinite(sinceSequence) && sinceSequence >= 0) {
+            captions = liveCaptionState.captions.filter((item) => item.sequence > sinceSequence);
+        } else {
+            captions = liveCaptionState.captions.slice(-initialLimit);
+        }
+
+        return res.json({
+            status: "ok",
+            latestSequence: liveCaptionState.latestSequence,
+            startedAt: new Date(liveCaptionState.startedAt).toISOString(),
+            availableLanguages: getAvailableLanguages(),
+            captions,
+        });
+    } catch (error) {
+        console.error("Error getting live captions stream", error);
+        return res.status(500).json({
+            status: "Internal server error",
+            latestSequence: liveCaptionState.latestSequence,
+            captions: [],
+            availableLanguages: [],
+        });
+    }
+});
+
+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 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(),
+            original,
+            ...translations,
+        };
+
+        liveCaptionState.latestSequence = sequence;
+        liveCaptionState.captions.push(caption);
+        if (liveCaptionState.captions.length > MAX_BUFFER_SIZE) {
+            liveCaptionState.captions.splice(0, liveCaptionState.captions.length - MAX_BUFFER_SIZE);
+        }
+
+        return res.json({
+            status: "ok",
+            caption,
+            latestSequence: liveCaptionState.latestSequence,
+            availableLanguages: getAvailableLanguages(),
+        });
+    } catch (error) {
+        console.error("Error ingesting live captions", error);
+        return res.status(500).json({ status: "Internal server error" });
+    }
+});
+
+router.post("/reset", async (_, res) => {
+    try {
+        // TODO: Add admin authorization before exposing this endpoint.
+        liveCaptionState.startedAt = Date.now();
+        liveCaptionState.latestSequence = 0;
+        liveCaptionState.captions = [];
+        return res.json({ status: "ok" });
+    } catch (error) {
+        console.error("Error resetting live captions state", error);
+        return res.status(500).json({ status: "Internal server error" });
+    }
+});
+
+module.exports = router;

routes/post.js

@@ -4,6 +4,7 @@ var router = express.Router();
 const DB = require("./../mongoDB.js");
 const Post = require("./../def/post.js");
 const Notifications = require("./../notifications.js");
+const { translateText, normalizeLanguageCode } = require("../utils/chatTranslation.js");
 
 DB.getDB.then((DB) => {
 
@@ -481,6 +482,47 @@ DB.getDB.then((DB) => {
         })
     });
 
+    router.post("/translate", async (req, res) => {
+        let postid = req.body.postid;
+        let targetLang = normalizeLanguageCode(req.body.targetLang);
+        
+        // Return ack immediately
+        res.json({ status: "ok", message: "Translation queued" });
+
+        if (!postid || !targetLang) return;
+
+        try {
+            // Get post
+            const posts = await DB.getPostsByTag('', null); // No good way to get one post by ID directly exposed? 
+            // Let's use dbCols directly if needed or find it. Wait, how do we get a single post?
+            // I'll assume DB.getPost exists, let me check that later. Actually I will use DB.postCols directly.
+            const post = await DB.postCols.findOne({ _id: DB.ObjectID(postid) });
+            if (!post || !post.content) return;
+
+            // Strip inline tags and bible tags before translating to reduce token usage and confusion,
+            // or just translate the raw content and let the AI handle it? The chat translator prompt says:
+            // "You translate chat messages. Keep meaning, tone, emojis, names, and references. Return only the translated text."
+            // So it can handle tags.
+
+            // To avoid huge translations or mostly-media posts
+            if (post.content.length > 1000) return;
+
+            if (post.translations && post.translations[targetLang]) return;
+
+            const translation = await translateText({
+                text: post.content,
+                sourceLang: "auto",
+                targetLang: targetLang
+            });
+
+            if (translation && translation.translatedText) {
+                await DB.addTranslation(postid, targetLang, translation.translatedText);
+            }
+        } catch (error) {
+            console.error("Error in background post translation", error);
+        }
+    });
+
     /**
  * @swagger
  * /post/react:

scripts/liveCaptionsTestSender.js

@@ -0,0 +1,74 @@
+#!/usr/bin/env node
+
+require("dotenv").config();
+const axios = require("axios");
+
+const baseUrl = (process.env.CAPTION_TEST_BASE_URL || process.env.BASE_URL || "http://localhost:3000").replace(/\/+$/, "");
+const ingestUrl = `${baseUrl}/live-captions/ingest`;
+const intervalMs = 5000;
+
+const samples = [
+    {
+        original: "Bienvenidos a nuestro servicio de adoracion.",
+        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.",
+        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.",
+        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.",
+        es: "Tomemos un momento para orar.",
+        en: "Let us take a moment to pray.",
+        fr: "Prenons un moment pour prier.",
+    },
+];
+
+let sampleIndex = 0;
+let timer = null;
+
+const sendNextSample = async () => {
+    const payload = samples[sampleIndex];
+    sampleIndex = (sampleIndex + 1) % samples.length;
+
+    try {
+        const response = await axios.post(ingestUrl, payload, {
+            headers: { "Content-Type": "application/json" },
+            timeout: 10000,
+        });
+        const seq = response?.data?.caption?.sequence || response?.data?.latestSequence || "?";
+        console.log(`[live-captions:test-sender] sent sequence=${seq} original="${payload.original}"`);
+    } catch (error) {
+        const status = error?.response?.status;
+        const body = error?.response?.data;
+        const message = error?.message || "request failed";
+        console.error("[live-captions:test-sender] send failed", { status, body, message });
+    }
+};
+
+const start = async () => {
+    console.log(`[live-captions:test-sender] posting to ${ingestUrl} every ${intervalMs / 1000}s`);
+    await sendNextSample();
+    timer = setInterval(sendNextSample, intervalMs);
+};
+
+const shutdown = () => {
+    if (timer) clearInterval(timer);
+    console.log("[live-captions:test-sender] stopped");
+    process.exit(0);
+};
+
+process.on("SIGINT", shutdown);
+process.on("SIGTERM", shutdown);
+
+start();

utils/chatTranslation.js

@@ -0,0 +1,97 @@
+const axios = require("axios");
+
+const DEFAULT_MODEL = process.env.OPENAI_TRANSLATION_MODEL || process.env.OPENAI_MODEL || "gpt-4o-mini";
+
+const normalizeLanguageCode = (rawLanguage) => {
+    if (!rawLanguage || typeof rawLanguage !== "string") return "en";
+    const firstValue = rawLanguage.split(",")[0].trim().toLowerCase();
+    if (!firstValue) return "en";
+    const noQuality = firstValue.split(";")[0].trim();
+    const shortCode = noQuality.split("-")[0].trim();
+    return shortCode || "en";
+};
+
+const extractOutputText = (data) => {
+    if (!data) return "";
+    if (typeof data.output_text === "string" && data.output_text.trim()) {
+        return data.output_text.trim();
+    }
+    if (!Array.isArray(data.output)) return "";
+    const chunks = [];
+    data.output.forEach((item) => {
+        if (!Array.isArray(item?.content)) return;
+        item.content.forEach((entry) => {
+            if (entry?.type === "output_text" && typeof entry?.text === "string") {
+                chunks.push(entry.text);
+            }
+        });
+    });
+    return chunks.join("\n").trim();
+};
+
+const translateText = async ({ text, sourceLang, targetLang }) => {
+    const normalizedSource = normalizeLanguageCode(sourceLang);
+    const normalizedTarget = normalizeLanguageCode(targetLang);
+    if (!text || !normalizedTarget || normalizedSource === normalizedTarget) {
+        return {
+            translatedText: text,
+            provider: "none",
+            model: "none",
+        };
+    }
+
+    const apiKey = process.env.OPENAI_API_KEY;
+    if (!apiKey) return null;
+
+    try {
+        const response = await axios.post(
+            "https://api.openai.com/v1/responses",
+            {
+                model: DEFAULT_MODEL,
+                input: [
+                    {
+                        role: "system",
+                        content: [
+                            {
+                                type: "input_text",
+                                text: "You translate chat messages and posts. Keep meaning, tone, emojis, names, and references. Do not translate structural tags starting with @ (e.g. @image:..., @youtube:..., @bible:...). Leave them exactly as they are or omit them if they do not fit the text flow. Return only the translated text.",
+                            },
+                        ],
+                    },
+                    {
+                        role: "user",
+                        content: [
+                            {
+                                type: "input_text",
+                                text: `Translate this message from ${normalizedSource} to ${normalizedTarget}:\n\n${text}`,
+                            },
+                        ],
+                    },
+                ],
+            },
+            {
+                timeout: 15000,
+                headers: {
+                    "Content-Type": "application/json",
+                    Authorization: `Bearer ${apiKey}`,
+                },
+            }
+        );
+
+        const translatedText = extractOutputText(response?.data);
+        if (!translatedText) return null;
+        return {
+            translatedText,
+            provider: "openai",
+            model: DEFAULT_MODEL,
+        };
+    } catch (error) {
+        console.error("Error translating chat message", error?.response?.data || error?.message || error);
+        return null;
+    }
+};
+
+module.exports = {
+    normalizeLanguageCode,
+    translateText,
+};