feat: 代理商资金可见性重构(agent-fund-visibility)
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- 将 GET /shops/commission-summary 重命名为 GET /shops/fund-summary,
  响应新增 main_balance、main_frozen_balance 两个预充值钱包字段
- 新增 GET /shops/:id/main-wallet/transactions 预充值钱包流水接口
- 将佣金统计、每日统计、发起提现从 /my/ 路径迁移至 /shops/:id/ 路径:
  GET /shops/:id/commission-stats
  GET /shops/:id/commission-daily-stats
  POST /shops/:id/withdrawal-requests
- 删除 MyCommissionService、MyCommissionHandler 及全部 /my/ 路由
- 补齐 ListShopWithdrawalRequests、ListShopCommissionRecords 的
  CanManageShop 越权校验(安全修复)
- 提现接口增加严格权限:仅代理账号本人可为自己店铺发起提现

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
2026-04-09 14:40:39 +08:00
parent 1d6535b81b
commit 0627ffec42
25 changed files with 1806 additions and 1426 deletions

View File

@@ -3,6 +3,8 @@ package shop_commission
import (
"context"
"encoding/json"
"fmt"
"math/rand"
"time"
"github.com/break/junhong_cmp_fiber/internal/model"
@@ -11,41 +13,52 @@ import (
"github.com/break/junhong_cmp_fiber/internal/store/postgres"
"github.com/break/junhong_cmp_fiber/pkg/constants"
"github.com/break/junhong_cmp_fiber/pkg/errors"
"github.com/break/junhong_cmp_fiber/pkg/middleware"
"go.uber.org/zap"
"gorm.io/gorm"
)
// Service 代理商资金管理服务
type Service struct {
shopStore *postgres.ShopStore
accountStore *postgres.AccountStore
agentWalletStore *postgres.AgentWalletStore
commissionWithdrawalReqStore *postgres.CommissionWithdrawalRequestStore
commissionRecordStore *postgres.CommissionRecordStore
db *gorm.DB
logger *zap.Logger
shopStore *postgres.ShopStore
accountStore *postgres.AccountStore
agentWalletStore *postgres.AgentWalletStore
commissionWithdrawalReqStore *postgres.CommissionWithdrawalRequestStore
commissionWithdrawalSettingStore *postgres.CommissionWithdrawalSettingStore
commissionRecordStore *postgres.CommissionRecordStore
agentWalletTransactionStore *postgres.AgentWalletTransactionStore
db *gorm.DB
logger *zap.Logger
}
// New 创建代理商资金管理服务
func New(
shopStore *postgres.ShopStore,
accountStore *postgres.AccountStore,
agentWalletStore *postgres.AgentWalletStore,
commissionWithdrawalReqStore *postgres.CommissionWithdrawalRequestStore,
commissionWithdrawalSettingStore *postgres.CommissionWithdrawalSettingStore,
commissionRecordStore *postgres.CommissionRecordStore,
agentWalletTransactionStore *postgres.AgentWalletTransactionStore,
db *gorm.DB,
logger *zap.Logger,
) *Service {
return &Service{
shopStore: shopStore,
accountStore: accountStore,
agentWalletStore: agentWalletStore,
commissionWithdrawalReqStore: commissionWithdrawalReqStore,
commissionRecordStore: commissionRecordStore,
db: db,
logger: logger,
shopStore: shopStore,
accountStore: accountStore,
agentWalletStore: agentWalletStore,
commissionWithdrawalReqStore: commissionWithdrawalReqStore,
commissionWithdrawalSettingStore: commissionWithdrawalSettingStore,
commissionRecordStore: commissionRecordStore,
agentWalletTransactionStore: agentWalletTransactionStore,
db: db,
logger: logger,
}
}
func (s *Service) ListShopCommissionSummary(ctx context.Context, req *dto.ShopCommissionSummaryListReq) (*dto.ShopCommissionSummaryPageResult, error) {
// ListShopFundSummary 代理商资金概况列表(含预充值余额和佣金钱包)
// GET /shops/fund-summary
func (s *Service) ListShopFundSummary(ctx context.Context, req *dto.ShopFundSummaryListReq) (*dto.ShopFundSummaryPageResult, error) {
opts := &store.QueryOptions{
Page: req.Page,
PageSize: req.PageSize,
@@ -69,8 +82,8 @@ func (s *Service) ListShopCommissionSummary(ctx context.Context, req *dto.ShopCo
}
if len(shops) == 0 {
return &dto.ShopCommissionSummaryPageResult{
Items: []dto.ShopCommissionSummaryItem{},
return &dto.ShopFundSummaryPageResult{
Items: []dto.ShopFundSummaryItem{},
Total: 0,
Page: opts.Page,
Size: opts.PageSize,
@@ -82,6 +95,12 @@ func (s *Service) ListShopCommissionSummary(ctx context.Context, req *dto.ShopCo
shopIDs = append(shopIDs, shop.ID)
}
// 批量获取主钱包(预充值钱包)余额
mainWallets, err := s.agentWalletStore.GetShopMainWalletBatch(ctx, shopIDs)
if err != nil {
return nil, errors.Wrap(errors.CodeInternalError, err, "查询主钱包余额失败")
}
walletSummaries, err := s.agentWalletStore.GetShopCommissionSummaryBatch(ctx, shopIDs)
if err != nil {
return nil, errors.Wrap(errors.CodeInternalError, err, "查询店铺钱包汇总失败")
@@ -109,7 +128,7 @@ func (s *Service) ListShopCommissionSummary(ctx context.Context, req *dto.ShopCo
}
}
items := make([]dto.ShopCommissionSummaryItem, 0, len(shops))
items := make([]dto.ShopFundSummaryItem, 0, len(shops))
for _, shop := range shops {
if req.Username != "" {
acc := accountMap[shop.ID]
@@ -119,11 +138,11 @@ func (s *Service) ListShopCommissionSummary(ctx context.Context, req *dto.ShopCo
}
}
item := s.buildCommissionSummaryItem(shop, walletSummaries[shop.ID], withdrawnAmounts[shop.ID], withdrawingAmounts[shop.ID], accountMap[shop.ID])
item := s.buildFundSummaryItem(shop, mainWallets[shop.ID], walletSummaries[shop.ID], withdrawnAmounts[shop.ID], withdrawingAmounts[shop.ID], accountMap[shop.ID])
items = append(items, item)
}
return &dto.ShopCommissionSummaryPageResult{
return &dto.ShopFundSummaryPageResult{
Items: items,
Total: total,
Page: opts.Page,
@@ -131,11 +150,20 @@ func (s *Service) ListShopCommissionSummary(ctx context.Context, req *dto.ShopCo
}, nil
}
func (s *Service) buildCommissionSummaryItem(shop *model.Shop, walletSummary *model.AgentWallet, withdrawnAmount, withdrawingAmount int64, account *model.Account) dto.ShopCommissionSummaryItem {
// buildFundSummaryItem 构造资金概况条目
func (s *Service) buildFundSummaryItem(shop *model.Shop, mainWallet, commissionWallet *model.AgentWallet, withdrawnAmount, withdrawingAmount int64, account *model.Account) dto.ShopFundSummaryItem {
// 主钱包余额若未充值则为0
var mainBalance, mainFrozenBalance int64
if mainWallet != nil {
mainBalance = mainWallet.Balance
mainFrozenBalance = mainWallet.FrozenBalance
}
// 佣金钱包
var balance, frozenBalance int64
if walletSummary != nil {
balance = walletSummary.Balance
frozenBalance = walletSummary.FrozenBalance
if commissionWallet != nil {
balance = commissionWallet.Balance
frozenBalance = commissionWallet.FrozenBalance
}
totalCommission := balance + frozenBalance + withdrawnAmount
@@ -151,12 +179,14 @@ func (s *Service) buildCommissionSummaryItem(shop *model.Shop, walletSummary *mo
phone = account.Phone
}
return dto.ShopCommissionSummaryItem{
return dto.ShopFundSummaryItem{
ShopID: shop.ID,
ShopName: shop.ShopName,
ShopCode: shop.ShopCode,
Username: username,
Phone: phone,
MainBalance: mainBalance,
MainFrozenBalance: mainFrozenBalance,
TotalCommission: totalCommission,
WithdrawnCommission: withdrawnAmount,
UnwithdrawCommission: unwithdrawCommission,
@@ -167,7 +197,14 @@ func (s *Service) buildCommissionSummaryItem(shop *model.Shop, walletSummary *mo
}
}
// ListShopWithdrawalRequests 查询代理商提现记录
// GET /shops/:id/withdrawal-requests
func (s *Service) ListShopWithdrawalRequests(ctx context.Context, shopID uint, req *dto.ShopWithdrawalRequestListReq) (*dto.ShopWithdrawalRequestPageResult, error) {
// 越权校验:平台人员可查所有,代理只能查自己和下级
if err := middleware.CanManageShop(ctx, shopID); err != nil {
return nil, errors.New(errors.CodeForbidden, "无权限操作该资源或资源不存在")
}
_, err := s.shopStore.GetByID(ctx, shopID)
if err != nil {
return nil, errors.New(errors.CodeShopNotFound, "店铺不存在")
@@ -252,6 +289,7 @@ func (s *Service) ListShopWithdrawalRequests(ctx context.Context, shopID uint, r
}, nil
}
// buildWithdrawalRequestItem 构造提现记录条目
func (s *Service) buildWithdrawalRequestItem(r *model.CommissionWithdrawalRequest, shopName, shopHierarchy string, applicantMap, processorMap map[uint]string) dto.ShopWithdrawalRequestItem {
var processorID *uint
if r.ProcessorID > 0 {
@@ -311,6 +349,7 @@ func (s *Service) buildWithdrawalRequestItem(r *model.CommissionWithdrawalReques
}
}
// buildShopHierarchyPath 构造店铺层级路径(最多两层上级)
func (s *Service) buildShopHierarchyPath(ctx context.Context, shop *model.Shop) string {
if shop == nil {
return ""
@@ -333,7 +372,14 @@ func (s *Service) buildShopHierarchyPath(ctx context.Context, shop *model.Shop)
return path
}
// ListShopCommissionRecords 查询代理商佣金明细
// GET /shops/:id/commission-records
func (s *Service) ListShopCommissionRecords(ctx context.Context, shopID uint, req *dto.ShopCommissionRecordListReq) (*dto.ShopCommissionRecordPageResult, error) {
// 越权校验:平台人员可查所有,代理只能查自己和下级
if err := middleware.CanManageShop(ctx, shopID); err != nil {
return nil, errors.New(errors.CodeForbidden, "无权限操作该资源或资源不存在")
}
_, err := s.shopStore.GetByID(ctx, shopID)
if err != nil {
return nil, errors.New(errors.CodeShopNotFound, "店铺不存在")
@@ -391,47 +437,292 @@ func (s *Service) ListShopCommissionRecords(ctx context.Context, shopID uint, re
}, nil
}
func getWithdrawalStatusName(status int) string {
switch status {
case constants.WithdrawalStatusPending:
return "待审核"
case constants.WithdrawalStatusApproved:
return "已通过"
case constants.WithdrawalStatusRejected:
return "已拒绝"
case constants.WithdrawalStatusPaid:
return "已到账"
default:
return "未知"
// GetStats 获取佣金统计
// GET /shops/:id/commission-stats
func (s *Service) GetStats(ctx context.Context, shopID uint, req *dto.CommissionStatsRequest) (*dto.CommissionStatsResponse, error) {
// 越权校验:平台人员可查所有,代理只能查自己和下级
if err := middleware.CanManageShop(ctx, shopID); err != nil {
return nil, errors.New(errors.CodeForbidden, "无权限操作该资源或资源不存在")
}
}
func getCommissionStatusName(status int) string {
switch status {
case constants.CommissionStatusFrozen:
return "已冻结"
case constants.CommissionStatusUnfreezing:
return "解冻中"
case constants.CommissionStatusReleased:
return "已发放"
case constants.CommissionStatusInvalid:
return "已失效"
default:
return "未知"
filters := &postgres.CommissionRecordListFilters{
ShopID: shopID,
StartTime: req.StartTime,
EndTime: req.EndTime,
}
stats, err := s.commissionRecordStore.GetStats(ctx, filters)
if err != nil {
return nil, errors.Wrap(errors.CodeInternalError, err, "获取佣金统计失败")
}
if stats == nil {
return &dto.CommissionStatsResponse{}, nil
}
var costDiffPercent, oneTimePercent int64
if stats.TotalAmount > 0 {
costDiffPercent = stats.CostDiffAmount * 1000 / stats.TotalAmount
oneTimePercent = stats.OneTimeAmount * 1000 / stats.TotalAmount
}
return &dto.CommissionStatsResponse{
TotalAmount: stats.TotalAmount,
CostDiffAmount: stats.CostDiffAmount,
OneTimeAmount: stats.OneTimeAmount,
CostDiffPercent: costDiffPercent,
OneTimePercent: oneTimePercent,
TotalCount: stats.TotalCount,
CostDiffCount: stats.CostDiffCount,
OneTimeCount: stats.OneTimeCount,
}, nil
}
func containsSubstring(s, substr string) bool {
return len(s) >= len(substr) && (s == substr || len(substr) == 0 || (len(s) > 0 && len(substr) > 0 && contains(s, substr)))
// GetDailyStats 获取每日佣金统计
// GET /shops/:id/commission-daily-stats
func (s *Service) GetDailyStats(ctx context.Context, shopID uint, req *dto.DailyCommissionStatsRequest) ([]*dto.DailyCommissionStatsResponse, error) {
// 越权校验:平台人员可查所有,代理只能查自己和下级
if err := middleware.CanManageShop(ctx, shopID); err != nil {
return nil, errors.New(errors.CodeForbidden, "无权限操作该资源或资源不存在")
}
days := 30
if req.Days != nil && *req.Days > 0 {
days = *req.Days
}
filters := &postgres.CommissionRecordListFilters{
ShopID: shopID,
StartTime: req.StartDate,
EndTime: req.EndDate,
}
dailyStats, err := s.commissionRecordStore.GetDailyStats(ctx, filters, days)
if err != nil {
return nil, errors.Wrap(errors.CodeInternalError, err, "获取每日佣金统计失败")
}
result := make([]*dto.DailyCommissionStatsResponse, 0, len(dailyStats))
for _, stat := range dailyStats {
result = append(result, &dto.DailyCommissionStatsResponse{
Date: stat.Date,
TotalAmount: stat.TotalAmount,
TotalCount: stat.TotalCount,
})
}
return result, nil
}
func contains(s, substr string) bool {
for i := 0; i <= len(s)-len(substr); i++ {
if s[i:i+len(substr)] == substr {
return true
// CreateWithdrawalRequest 代理发起提现申请
// POST /shops/:id/withdrawal-requests
func (s *Service) CreateWithdrawalRequest(ctx context.Context, shopID uint, req *dto.CreateMyWithdrawalReq) (*dto.CreateMyWithdrawalResp, error) {
// 提现权限比查询更严格:必须是代理账号本人操作,不允许平台人员或顶级代理替下级提现
userType := middleware.GetUserTypeFromContext(ctx)
if userType != constants.UserTypeAgent {
return nil, errors.New(errors.CodeForbidden, "仅代理商用户可发起提现")
}
if shopID != middleware.GetShopIDFromContext(ctx) {
return nil, errors.New(errors.CodeForbidden, "仅可为本人店铺发起提现")
}
currentUserID := middleware.GetUserIDFromContext(ctx)
if currentUserID == 0 {
return nil, errors.New(errors.CodeForbidden, "无法获取用户信息")
}
// 获取提现配置
setting, err := s.commissionWithdrawalSettingStore.GetCurrent(ctx)
if err != nil {
return nil, errors.New(errors.CodeInvalidParam, "暂未开放提现功能")
}
// 验证最低提现金额
if req.Amount < setting.MinWithdrawalAmount {
return nil, errors.New(errors.CodeInvalidParam, fmt.Sprintf("提现金额不能低于 %.2f 元", float64(setting.MinWithdrawalAmount)/100))
}
// 获取佣金钱包
wallet, err := s.agentWalletStore.GetCommissionWallet(ctx, shopID)
if err != nil {
return nil, errors.New(errors.CodeInsufficientBalance, "钱包不存在")
}
// 验证可用余额
if req.Amount > wallet.GetAvailableBalance() {
return nil, errors.New(errors.CodeInsufficientBalance, "可提现余额不足")
}
// 验证今日提现次数
today := time.Now().Format("2006-01-02")
var todayCount int64
s.db.WithContext(ctx).Model(&model.CommissionWithdrawalRequest{}).
Where("shop_id = ? AND created_at >= ? AND created_at <= ?", shopID, today+" 00:00:00", today+" 23:59:59").
Count(&todayCount)
if int(todayCount) >= setting.DailyWithdrawalLimit {
return nil, errors.New(errors.CodeInvalidParam, "今日提现次数已达上限")
}
// 计算手续费
fee := req.Amount * setting.FeeRate / 10000
actualAmount := req.Amount - fee
withdrawalNo := generateWithdrawalNo()
accountInfo := map[string]string{
"account_name": req.AccountName,
"account_number": req.AccountNumber,
}
accountInfoJSON, _ := json.Marshal(accountInfo)
var withdrawalRequest *model.CommissionWithdrawalRequest
err = s.db.Transaction(func(tx *gorm.DB) error {
// 使用条件更新防并发
result := tx.WithContext(ctx).Model(&model.AgentWallet{}).
Where("id = ? AND balance - frozen_balance >= ?", wallet.ID, req.Amount).
Updates(map[string]interface{}{
"frozen_balance": gorm.Expr("frozen_balance + ?", req.Amount),
})
if result.Error != nil {
return errors.Wrap(errors.CodeInternalError, result.Error, "冻结余额失败")
}
if result.RowsAffected == 0 {
return errors.New(errors.CodeInsufficientBalance, "余额不足或并发冲突,请稍后重试")
}
withdrawalRequest = &model.CommissionWithdrawalRequest{
WithdrawalNo: withdrawalNo,
ShopID: shopID,
ApplicantID: currentUserID,
Amount: req.Amount,
FeeRate: setting.FeeRate,
Fee: fee,
ActualAmount: actualAmount,
WithdrawalMethod: req.WithdrawalMethod,
AccountInfo: accountInfoJSON,
Status: 1, // 待审核
}
withdrawalRequest.Creator = currentUserID
withdrawalRequest.Updater = currentUserID
if err := tx.WithContext(ctx).Create(withdrawalRequest).Error; err != nil {
return errors.Wrap(errors.CodeInternalError, err, "创建提现申请失败")
}
remark := fmt.Sprintf("提现冻结,单号:%s", withdrawalNo)
refType := constants.ReferenceTypeWithdrawal
transaction := &model.AgentWalletTransaction{
AgentWalletID: wallet.ID,
ShopID: shopID,
UserID: currentUserID,
TransactionType: constants.TransactionTypeWithdrawal,
Amount: -req.Amount,
BalanceBefore: wallet.Balance,
BalanceAfter: wallet.Balance - req.Amount,
Status: constants.TransactionStatusProcessing,
ReferenceType: &refType,
ReferenceID: &withdrawalRequest.ID,
Remark: &remark,
Creator: currentUserID,
ShopIDTag: shopID,
}
if err := tx.WithContext(ctx).Create(transaction).Error; err != nil {
return errors.Wrap(errors.CodeInternalError, err, "创建钱包流水失败")
}
return nil
})
if err != nil {
return nil, err
}
return false
return &dto.CreateMyWithdrawalResp{
ID: withdrawalRequest.ID,
WithdrawalNo: withdrawalRequest.WithdrawalNo,
Amount: withdrawalRequest.Amount,
FeeRate: withdrawalRequest.FeeRate,
Fee: withdrawalRequest.Fee,
ActualAmount: withdrawalRequest.ActualAmount,
Status: withdrawalRequest.Status,
StatusName: getWithdrawalStatusName(withdrawalRequest.Status),
CreatedAt: withdrawalRequest.CreatedAt.Format("2006-01-02 15:04:05"),
}, nil
}
// ListMainWalletTransactions 查询代理主钱包(预充值钱包)流水
// GET /shops/:id/main-wallet/transactions
func (s *Service) ListMainWalletTransactions(ctx context.Context, shopID uint, req *dto.MainWalletTransactionListRequest) (*dto.MainWalletTransactionListResponse, error) {
// 越权校验
if err := middleware.CanManageShop(ctx, shopID); err != nil {
return nil, errors.New(errors.CodeForbidden, "无权限操作该资源或资源不存在")
}
page := req.Page
pageSize := req.PageSize
if page == 0 {
page = 1
}
if pageSize == 0 {
pageSize = constants.DefaultPageSize
}
// 获取主钱包,不存在则返回空列表
mainWallet, err := s.agentWalletStore.GetMainWallet(ctx, shopID)
if err != nil {
return &dto.MainWalletTransactionListResponse{
Items: []dto.MainWalletTransactionItem{},
Total: 0,
Page: page,
Size: pageSize,
}, nil
}
filters := &postgres.AgentWalletTransactionListFilters{
TransactionType: req.TransactionType,
StartDate: req.StartDate,
EndDate: req.EndDate,
}
offset := (page - 1) * pageSize
transactions, err := s.agentWalletTransactionStore.ListByWalletIDWithFilters(ctx, mainWallet.ID, offset, pageSize, filters)
if err != nil {
return nil, errors.Wrap(errors.CodeInternalError, err, "查询主钱包流水失败")
}
total, err := s.agentWalletTransactionStore.CountByWalletID(ctx, mainWallet.ID, filters)
if err != nil {
return nil, errors.Wrap(errors.CodeInternalError, err, "统计主钱包流水失败")
}
items := make([]dto.MainWalletTransactionItem, 0, len(transactions))
for _, t := range transactions {
var remark string
if t.Remark != nil {
remark = *t.Remark
}
var subtype string
if t.TransactionSubtype != nil {
subtype = *t.TransactionSubtype
}
items = append(items, dto.MainWalletTransactionItem{
ID: t.ID,
TransactionType: t.TransactionType,
TransactionSubtype: subtype,
Amount: t.Amount,
BalanceBefore: t.BalanceBefore,
BalanceAfter: t.BalanceAfter,
Remark: remark,
CreatedAt: t.CreatedAt.Format("2006-01-02 15:04:05"),
})
}
return &dto.MainWalletTransactionListResponse{
Items: items,
Total: total,
Page: page,
Size: pageSize,
}, nil
}
// ResolveCommissionRecord 修正待审佣金记录status=99
@@ -472,7 +763,6 @@ func (s *Service) ResolveCommissionRecord(ctx context.Context, recordID uint, re
}
return s.db.Transaction(func(tx *gorm.DB) error {
// 更新佣金记录
if err := s.commissionRecordStore.UpdateByID(ctx, tx, recordID, map[string]any{
"status": model.CommissionStatusReleased,
"amount": amount,
@@ -482,7 +772,6 @@ func (s *Service) ResolveCommissionRecord(ctx context.Context, recordID uint, re
return errors.Wrap(errors.CodeDatabaseError, err, "更新佣金记录失败")
}
// 入账到佣金钱包(乐观锁)
balanceBefore := wallet.Balance
result := tx.Model(&model.AgentWallet{}).
Where("id = ? AND version = ?", wallet.ID, wallet.Version).
@@ -497,7 +786,6 @@ func (s *Service) ResolveCommissionRecord(ctx context.Context, recordID uint, re
return errors.New(errors.CodeInternalError, "佣金钱包版本冲突,请重试")
}
// 回写入账后余额
if err := s.commissionRecordStore.UpdateByID(ctx, tx, recordID, map[string]any{
"balance_after": balanceBefore + amount,
}); err != nil {
@@ -507,3 +795,54 @@ func (s *Service) ResolveCommissionRecord(ctx context.Context, recordID uint, re
return nil
})
}
// getWithdrawalStatusName 获取提现状态名称
func getWithdrawalStatusName(status int) string {
switch status {
case constants.WithdrawalStatusPending:
return "待审核"
case constants.WithdrawalStatusApproved:
return "已通过"
case constants.WithdrawalStatusRejected:
return "已拒绝"
case constants.WithdrawalStatusPaid:
return "已到账"
default:
return "未知"
}
}
// getCommissionStatusName 获取佣金状态名称
func getCommissionStatusName(status int) string {
switch status {
case constants.CommissionStatusFrozen:
return "已冻结"
case constants.CommissionStatusUnfreezing:
return "解冻中"
case constants.CommissionStatusReleased:
return "已发放"
case constants.CommissionStatusInvalid:
return "已失效"
default:
return "未知"
}
}
// generateWithdrawalNo 生成提现单号
func generateWithdrawalNo() string {
now := time.Now()
return fmt.Sprintf("W%s%04d", now.Format("20060102150405"), rand.Intn(10000))
}
func containsSubstring(s, substr string) bool {
return len(s) >= len(substr) && (s == substr || len(substr) == 0 || (len(s) > 0 && len(substr) > 0 && contains(s, substr)))
}
func contains(s, substr string) bool {
for i := 0; i <= len(s)-len(substr); i++ {
if s[i:i+len(substr)] == substr {
return true
}
}
return false
}