feat(user): add user type modification endpoint

- Implement new endpoint `/userMgr/modifyType` for updating user types
- Add database function DBUpdateUserType to handle type updates
- Include request validation and proper error handling
- Update API documentation with new endpoint details

database.go

@@ -346,6 +346,14 @@ func DBQuerySpecificUser(userID int) (User, error) { // Query user by ID
 	return user, nil
 }
 
+func DBUpdateUserType (userID int, newType string) error {
+	_, err := db.Exec("UPDATE userLogin SET type = ? WHERE userID = ?", newType, userID)
+	if err != nil {
+		return fmt.Errorf("failed to update user type: %w", err)
+	}
+	return nil
+}
+
 func DBAddFrpcInstance(instance FrpcInstance) error {
 	_, err := frpcDB.Exec("INSERT INTO frpcInstances (userID, name, bootAtStart, runUser, configPath, createdAt) VALUES (?, ?, ?, ?, ?, ?)",
 		instance.UserID, instance.Name, instance.BootAtStart, instance.RunUser, instance.ConfigPath, time.Now().Format(time.RFC3339))

docs/api.md

@@ -277,6 +277,38 @@ X-Timestamp: 1704067200000
 
 ---
 
+## Modify User Type
+
+**Endpoint**: `/userMgr/modifyType`  
+**Method**: POST  
+**Content-Type**: application/json  
+**Auth Required**: Yes (token)  
+**Permission Level**: Superuser
+
+**Request Headers**:
+```
+X-Token: your_token
+X-Timestamp: 1704067200000
+```
+
+**Request Body**:
+```json
+{
+  "userID": 2,
+  "newType": "superadmin"
+}
+```
+
+**Response**:
+```json
+{
+  "success": true,
+  "message": "User type updated successfully"
+}
+```
+
+---
+
 ## List Users
 
 **Endpoint**: `/userMgr/list`  

router.go

@@ -21,7 +21,7 @@ func setupRoutes() {
 	http.HandleFunc("/userMgr/create", CreateUserHandler)
 	http.HandleFunc("/userMgr/remove", RemoveUserHandler)
 	http.HandleFunc("/userMgr/list", ListUserHandler)
-	// http.HandleFunc("/userMgr/modify", ModifyUserHandler)
+	http.HandleFunc("/userMgr/modifyType", ModifyUserTypeHandler)
 
 	http.HandleFunc("/sessionMgr/list", ListActiveSessionsHandler)
 	http.HandleFunc("/sessionMgr/remove", RemoveSessionHandler)

userAct.go

@@ -24,6 +24,11 @@ type CreateUserRequest struct {
 	Type     string `json:"type"`
 }
 
+type ModifyUserRequest struct {
+	UserID int `json:"userID"`
+	Type   string `json:"newType"`
+}
+
 type RemoveUserRequest struct {
 	TargetUserID int `json:"targetUserID"`
 }
@@ -310,6 +315,48 @@ func CreateUserHandler(w http.ResponseWriter, r *http.Request) {
 	postLog.Info(fmt.Sprintf("[CreateUserHandler] User \"%s\" created successfully with ID: %d", req.Username, userID))
 }
 
+func ModifyUserTypeHandler (w http.ResponseWriter, r *http.Request) {
+	_, err := Auth(w, r, http.MethodPost, "superuser")
+	if err != nil {
+		SendErrorResponse(w, http.StatusUnauthorized, err.Error())
+		postLog.Warning(fmt.Sprintf("[ModifyUserHandler] Auth failed: %v", err))
+		return
+	}
+
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		SendErrorResponse(w, http.StatusBadRequest, "Failed to read request body")
+		postLog.Warning(fmt.Sprintf("[ModifyUserHandler] Failed to read request body: %v", err))
+		return
+	}
+	defer r.Body.Close()
+
+	var req ModifyUserRequest
+
+	if err := json.Unmarshal(body, &req); err != nil {
+		SendErrorResponse(w, http.StatusBadRequest, "Invalid request format")
+		postLog.Warning(fmt.Sprintf("[ModifyUserHandler] Invalid request format: %v", err))
+		return
+	}
+	if req.UserID == 0 {
+		SendErrorResponse(w, http.StatusBadRequest, "UserID is required")
+		postLog.Warning("[ModifyUserHandler] ModifyUser failed: UserID is empty")
+		return
+	}
+	if req.Type != "admin" && req.Type != "visitor" && req.Type != "superuser" {
+		SendErrorResponse(w, http.StatusBadRequest, "Invalid type: must be 'admin' or 'visitor' or 'superuser'")
+		postLog.Warning(fmt.Sprintf("[ModifyUserHandler] ModifyUser failed: invalid type: %s", req.Type))
+		return
+	}
+	if err := DBUpdateUserType(req.UserID, req.Type); err != nil {
+		SendErrorResponse(w, http.StatusInternalServerError, err.Error())
+		postLog.Error(fmt.Sprintf("[ModifyUserHandler] Failed to update user type [%d]: %v", req.UserID, err))
+		return
+	}
+	SendSuccessResponse(w, "User type updated successfully", nil)
+	postLog.Info(fmt.Sprintf("[ModifyUserHandler] User [%d]%s type updated successfully to: %s", req.UserID, GetUsernameByID(req.UserID), req.Type))
+}
+
 func RemoveUserHandler(w http.ResponseWriter, r *http.Request) {
 	_, err := Auth(w, r, http.MethodPost, "superuser")
 	if err != nil {