Add local MarianMT translation service

utils/chatTranslation.js

@@ -1,6 +1,8 @@
 const axios = require("axios");
 
 const DEFAULT_MODEL = process.env.OPENAI_TRANSLATION_MODEL || process.env.OPENAI_MODEL || "gpt-4o-mini";
+const TRANSLATION_PROVIDER = (process.env.TRANSLATION_PROVIDER || "openai").trim().toLowerCase();
+const MARIAN_TRANSLATION_URL = (process.env.MARIAN_TRANSLATION_URL || "http://127.0.0.1:8000").replace(/\/$/, "");
 
 const normalizeLanguageCode = (rawLanguage) => {
     if (!rawLanguage || typeof rawLanguage !== "string") return "en";
@@ -40,6 +42,31 @@ const translateText = async ({ text, sourceLang, targetLang }) => {
         };
     }
 
+    if (TRANSLATION_PROVIDER === "marian") {
+        try {
+            const response = await axios.post(
+                `${MARIAN_TRANSLATION_URL}/translate`,
+                { text, sourceLang: sourceLang || "auto", targetLang: normalizedTarget },
+                { timeout: 30000, headers: { "Content-Type": "application/json" } }
+            );
+            const translatedText = response?.data?.translatedText?.trim();
+            if (!translatedText) return null;
+            return {
+                translatedText,
+                provider: response.data.provider || "marianmt",
+                model: response.data.model || "unknown",
+            };
+        } catch (error) {
+            console.error("Error translating with MarianMT", error?.response?.data || error?.message || error);
+            return null;
+        }
+    }
+
+    if (TRANSLATION_PROVIDER !== "openai") {
+        console.error(`Unsupported translation provider: ${TRANSLATION_PROVIDER}`);
+        return null;
+    }
+
     const apiKey = process.env.OPENAI_API_KEY;
     if (!apiKey) return null;