refactor: simplify Google AI model fetching by using synthetic response from existing keys

src/proxy/google-ai.ts

@@ -63,46 +63,31 @@ const getModelsResponse = () => {
 
 // Function to fetch native models from Google AI API
 const getNativeModelsResponse = async () => {
+  // Return cached value if it was refreshed in the last minute
   if (new Date().getTime() - nativeModelsCacheTime < 1000 * 60) {
     return nativeModelsCache;
   }
 
-  if (!config.googleAIKey) return { models: [] };
+  /*
+   * The official Google API requires an API key.  However SillyTavern only needs
+   * a list of model IDs and does not care about any other model metadata.  We
+   * can therefore generate a **synthetic** response from the keys already
+   * loaded into the proxy (same source we use for the OpenAI-compatible
+   * endpoint) and completely avoid the outbound request.  This removes the
+   * need for the frontend to supply the proxy password as an API key and
+   * prevents 4xx/5xx errors when the real Google API is unreachable or the key
+   * is missing.
+   */
+  const openaiStyle = getModelsResponse();
+  const models = (openaiStyle.data || []).map((m: any) => ({
+    // Google AI Studio returns names in the format "models/<id>"
+    name: `models/${m.id}`,
+    supportedGenerationMethods: ["generateContent"],
+  }));
 
-  const keys = keyPool
-    .list()
-    .filter((k) => k.service === "google-ai") as GoogleAIKey[];
-  if (keys.length === 0) {
-    nativeModelsCache = { models: [] };
-    nativeModelsCacheTime = new Date().getTime();
-    return nativeModelsCache;
-  }
-
-  try {
-    // Use the first available key to fetch models
-    const key = keys[0];
-    const apiVersion = "v1beta"; // Use the latest API version
-    const url = `https://generativelanguage.googleapis.com/${apiVersion}/models`;
-    
-    const response = await axios.get(url, {
-      headers: {
-        "Content-Type": "application/json",
-      },
-      params: {
-        key: key.key,
-      },
-    });
-
-    // We'll update the model cache but won't attempt to update the keys
-    // This avoids type issues while still keeping our models list up to date
-    nativeModelsCache = response.data;
-    nativeModelsCacheTime = new Date().getTime();
-    return nativeModelsCache;
-  } catch (error) {
-    console.error("Error fetching Google AI models:", error);
-    // Return empty model list on error
-    return { models: [] };
-  }
+  nativeModelsCache = { models };
+  nativeModelsCacheTime = new Date().getTime();
+  return nativeModelsCache;
 };
 
 const handleModelRequest: RequestHandler = (_req: Request, res: any) => {

src/server.ts

@@ -92,7 +92,7 @@ app.use("/admin", adminRouter);
 app.use((req, _, next) => {
   // For whatever reason SillyTavern just ignores the path a user provides
   // when using Google AI with reverse proxy.  We'll fix it here.
-  if (req.path.match(/^\/v1(alpha|beta)\/models\//)) {
+  if (req.path.match(/^\/v1(alpha|beta)\/models(\/|$)/)) {
     req.url = `${config.proxyEndpointRoute}/google-ai${req.url}`;
     return next();
   }