feat: add Go MCP server update API (#15261)

## What

#15240
implementation for PUT /api/v1/mcp/servers/:mcp_id

## Changes

- Adds the Go implementation for `PUT /api/v1/mcp/servers/:mcp_id`.
- Wires MCP service and handler into the Go server/router for the update
route.
- Preserves Python-style behavior for ownership checks, partial update
fields, MCP type/name/URL validation, `headers`/`variables`
normalization, and tool metadata scrubbing.

internal/handler/mcp.go

@@ -21,10 +21,12 @@ import (
 	"net/http"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/gin-gonic/gin"
 
 	"ragflow/internal/common"
+	"ragflow/internal/entity"
 	"ragflow/internal/service"
 )
 
@@ -32,6 +34,7 @@ const (
 	defaultMCPServerPage     = 0
 	defaultMCPServerPageSize = 0
 	maxMCPServerPageSize     = 100
+	mcpServerDateFormat      = "2006-01-02T15:04:05"
 )
 
 // MCPHandler handles MCP server requests.
@@ -39,6 +42,21 @@ type MCPHandler struct {
 	mcpService *service.MCPService
 }
 
+type mcpServerResponse struct {
+	ID          string                 `json:"id"`
+	Name        string                 `json:"name"`
+	TenantID    string                 `json:"tenant_id"`
+	URL         string                 `json:"url"`
+	ServerType  string                 `json:"server_type"`
+	Description *string                `json:"description"`
+	Variables   map[string]interface{} `json:"variables"`
+	Headers     map[string]interface{} `json:"headers"`
+	CreateTime  *int64                 `json:"create_time"`
+	CreateDate  string                 `json:"create_date"`
+	UpdateTime  *int64                 `json:"update_time"`
+	UpdateDate  string                 `json:"update_date"`
+}
+
 // NewMCPHandler creates an MCP handler.
 func NewMCPHandler(mcpService *service.MCPService) *MCPHandler {
 	return &MCPHandler{
@@ -118,6 +136,34 @@ func (h *MCPHandler) ListMCPServers(c *gin.Context) {
 	})
 }
 
+// UpdateMCPServer updates an MCP server for the current user.
+func (h *MCPHandler) UpdateMCPServer(c *gin.Context) {
+	user, errorCode, errorMessage := GetUser(c)
+	if errorCode != common.CodeSuccess {
+		jsonError(c, errorCode, errorMessage)
+		return
+	}
+
+	mcpID := c.Param("mcp_id")
+	var req service.UpdateMCPServerRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		jsonError(c, common.CodeDataError, err.Error())
+		return
+	}
+
+	result, code, err := h.mcpService.UpdateMCPServer(user.ID, mcpID, req)
+	if err != nil {
+		jsonError(c, code, err.Error())
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"code":    common.CodeSuccess,
+		"message": "success",
+		"data":    newMCPServerResponse(result),
+	})
+}
+
 // DeleteMCPServer deletes an MCP server for the current user.
 func (h *MCPHandler) DeleteMCPServer(c *gin.Context) {
 	user, errorCode, errorMessage := GetUser(c)
@@ -139,6 +185,34 @@ func (h *MCPHandler) DeleteMCPServer(c *gin.Context) {
 	})
 }
 
+func newMCPServerResponse(server *entity.MCPServer) *mcpServerResponse {
+	if server == nil {
+		return nil
+	}
+
+	return &mcpServerResponse{
+		ID:          server.ID,
+		Name:        server.Name,
+		TenantID:    server.TenantID,
+		URL:         server.URL,
+		ServerType:  server.ServerType,
+		Description: server.Description,
+		Variables:   map[string]interface{}(server.Variables),
+		Headers:     map[string]interface{}(server.Headers),
+		CreateTime:  server.CreateTime,
+		CreateDate:  formatMCPServerDate(server.CreateDate),
+		UpdateTime:  server.UpdateTime,
+		UpdateDate:  formatMCPServerDate(server.UpdateDate),
+	}
+}
+
+func formatMCPServerDate(date *time.Time) string {
+	if date == nil {
+		return ""
+	}
+	return date.Format(mcpServerDateFormat)
+}
+
 func parseMCPServerPage(value string) (int, error) {
 	if value == "" {
 		return defaultMCPServerPage, nil

internal/handler/mcp_test.go

@@ -0,0 +1,71 @@
+//
+//  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+
+package handler
+
+import (
+	"bytes"
+	"encoding/json"
+	"testing"
+	"time"
+
+	"ragflow/internal/entity"
+)
+
+func TestNewMCPServerResponsePreservesNullDescriptionAndFormatsDates(t *testing.T) {
+	createTime := int64(1779949820000)
+	updateTime := int64(1779953420000)
+	location := time.FixedZone("UTC+8", 8*60*60)
+	createDate := time.Date(2026, 5, 28, 10, 30, 20, 0, location)
+	updateDate := time.Date(2026, 5, 28, 11, 30, 20, 0, location)
+
+	response := newMCPServerResponse(&entity.MCPServer{
+		ID:         "mcp-id",
+		Name:       "server",
+		TenantID:   "tenant-id",
+		URL:        "https://example.com/mcp",
+		ServerType: "sse",
+		Variables:  entity.JSONMap{"tools": map[string]interface{}{}},
+		Headers:    entity.JSONMap{"Authorization": "Bearer token"},
+		BaseModel: entity.BaseModel{
+			CreateTime: &createTime,
+			CreateDate: &createDate,
+			UpdateTime: &updateTime,
+			UpdateDate: &updateDate,
+		},
+	})
+
+	if response.Description != nil {
+		t.Fatalf("description = %q, want nil", *response.Description)
+	}
+	if response.CreateDate != "2026-05-28T10:30:20" {
+		t.Fatalf("create_date = %q, want date without timezone", response.CreateDate)
+	}
+	if response.UpdateDate != "2026-05-28T11:30:20" {
+		t.Fatalf("update_date = %q, want date without timezone", response.UpdateDate)
+	}
+
+	payload, err := json.Marshal(response)
+	if err != nil {
+		t.Fatalf("marshal response: %v", err)
+	}
+	if !bytes.Contains(payload, []byte(`"description":null`)) {
+		t.Fatalf("payload %s does not preserve description:null", payload)
+	}
+	if bytes.Contains(payload, []byte(`+08:00`)) {
+		t.Fatalf("payload %s includes timezone in date fields", payload)
+	}
+}