fix:path rewriting & model list

internal/handlers/proxy_handler.go

@@ -986,6 +986,7 @@ func (h *ProxyHandler) getMaxRetries(isPreciseRouting bool, finalOpConfig *model
 }
 
 func (h *ProxyHandler) handleListModelsRequest(c *gin.Context) {
+
 	authTokenValue, exists := c.Get("authToken")
 	if !exists {
 		errToJSON(c, uuid.New().String(), errors.NewAPIError(errors.ErrUnauthorized, "Auth token not found in context"))
@@ -996,7 +997,61 @@ func (h *ProxyHandler) handleListModelsRequest(c *gin.Context) {
 		errToJSON(c, uuid.New().String(), errors.NewAPIError(errors.ErrInternalServer, "Invalid auth token type in context"))
 		return
 	}
-	modelNames := h.resourceService.GetAllowedModelsForToken(authToken)
+
+	groupName := c.Param("group_name")
+	h.logger.Infof("List models request: path=%s, groupName=%s", c.Request.URL.Path, groupName)
+	isPreciseRouting := groupName != ""
+
+	var modelNames []string
+
+	if isPreciseRouting {
+		group, ok := h.groupManager.GetGroupByName(groupName)
+		if !ok {
+			errToJSON(c, uuid.New().String(), errors.NewAPIError(errors.ErrNotFound, "Group not found"))
+			return
+		}
+
+		for _, modelMapping := range group.AllowedModels {
+			modelNames = append(modelNames, modelMapping.ModelName)
+		}
+
+		if len(modelNames) == 0 {
+			h.logger.Infof("Triggering passthrough for model list")
+			initialResources, err := h.resourceService.GetResourceFromGroup(c.Request.Context(), authToken, groupName)
+			if err != nil {
+				errToJSON(c, uuid.New().String(), errors.NewAPIError(errors.ErrInternalServer, "Failed to get resources"))
+				return
+			}
+
+			targetURL, _ := url.Parse(initialResources.UpstreamEndpoint.URL)
+			apiPath := strings.TrimPrefix(c.Request.URL.Path, "/proxy/"+groupName)
+			targetURL.Path = h.channel.RewritePath(targetURL.Path, apiPath)
+			h.logger.Infof("Final upstream path: %s", targetURL.String())
+			targetURL.RawQuery = c.Request.URL.RawQuery
+
+			req, _ := http.NewRequestWithContext(c.Request.Context(), "GET", targetURL.String(), nil)
+			h.channel.ModifyRequest(req, initialResources.APIKey)
+
+			client := &http.Client{Transport: h.transparentProxy.Transport}
+			resp, err := client.Do(req)
+			if err != nil {
+				errToJSON(c, uuid.New().String(), errors.NewAPIError(errors.ErrBadGateway, "Failed to fetch models"))
+				return
+			}
+			defer resp.Body.Close()
+
+			c.Writer.WriteHeader(resp.StatusCode)
+			for k, v := range resp.Header {
+				c.Writer.Header()[k] = v
+			}
+			io.Copy(c.Writer, resp.Body)
+			h.logger.Infof("Passthrough response sent")
+			return
+		}
+	} else {
+		modelNames = h.resourceService.GetAllowedModelsForToken(authToken)
+	}
+
 	if strings.Contains(c.Request.URL.Path, "/v1beta/") {
 		h.respondWithGeminiFormat(c, modelNames)
 	} else {