c1eb79e4ba
- Quota alert email now shows account ID and platform - Balance low email includes a "Top Up Now" button when recharge URL is configured - New setting: balance_low_notify_recharge_url in admin settings
501 lines
21 KiB
Go
501 lines
21 KiB
Go
package service
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import (
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"context"
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"fmt"
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"html"
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"log/slog"
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"strconv"
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"strings"
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"time"
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)
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const (
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emailSendTimeout = 30 * time.Second
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// Threshold type values
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thresholdTypeFixed = "fixed"
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thresholdTypePercentage = "percentage"
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// Quota dimension labels
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quotaDimDaily = "daily"
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quotaDimWeekly = "weekly"
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quotaDimTotal = "total"
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)
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// quotaDimLabels maps dimension names to display labels.
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var quotaDimLabels = map[string]string{
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quotaDimDaily: "日限额 / Daily",
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quotaDimWeekly: "周限额 / Weekly",
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quotaDimTotal: "总限额 / Total",
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}
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// AccountQuotaReader provides read access to account quota data.
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type AccountQuotaReader interface {
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GetByID(ctx context.Context, id int64) (*Account, error)
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}
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// BalanceNotifyService handles balance and quota threshold notifications.
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type BalanceNotifyService struct {
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emailService *EmailService
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settingRepo SettingRepository
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accountRepo AccountQuotaReader
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}
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// NewBalanceNotifyService creates a new BalanceNotifyService.
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func NewBalanceNotifyService(emailService *EmailService, settingRepo SettingRepository, accountRepo AccountQuotaReader) *BalanceNotifyService {
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return &BalanceNotifyService{
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emailService: emailService,
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settingRepo: settingRepo,
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accountRepo: accountRepo,
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}
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}
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// resolveBalanceThreshold returns the effective balance threshold.
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// For percentage type, it computes threshold = totalRecharged * percentage / 100.
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func resolveBalanceThreshold(threshold float64, thresholdType string, totalRecharged float64) float64 {
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if thresholdType == thresholdTypePercentage && totalRecharged > 0 {
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return totalRecharged * threshold / 100
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}
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return threshold
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}
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// CheckBalanceAfterDeduction checks if balance crossed below threshold after deduction.
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// oldBalance is the balance before deduction, cost is the amount deducted.
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// Notification is sent only on first crossing: oldBalance >= threshold && newBalance < threshold.
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func (s *BalanceNotifyService) CheckBalanceAfterDeduction(ctx context.Context, user *User, oldBalance, cost float64) {
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if user == nil || s.emailService == nil || s.settingRepo == nil {
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slog.Debug("CheckBalanceAfterDeduction: skipped (nil check)",
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"user_nil", user == nil,
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"email_svc_nil", s.emailService == nil,
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"setting_repo_nil", s.settingRepo == nil,
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)
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return
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}
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if !user.BalanceNotifyEnabled {
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slog.Debug("CheckBalanceAfterDeduction: user notify disabled", "user_id", user.ID)
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return
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}
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globalEnabled, globalThreshold, rechargeURL := s.getBalanceNotifyConfig(ctx)
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if !globalEnabled {
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slog.Info("CheckBalanceAfterDeduction: global notify disabled", "user_id", user.ID)
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return
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}
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// User custom threshold overrides system default
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threshold := globalThreshold
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if user.BalanceNotifyThreshold != nil {
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threshold = *user.BalanceNotifyThreshold
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}
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if threshold <= 0 {
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slog.Debug("CheckBalanceAfterDeduction: threshold <= 0", "user_id", user.ID, "threshold", threshold)
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return
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}
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effectiveThreshold := resolveBalanceThreshold(threshold, user.BalanceNotifyThresholdType, user.TotalRecharged)
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if effectiveThreshold <= 0 {
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slog.Debug("CheckBalanceAfterDeduction: effective threshold <= 0", "user_id", user.ID)
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return
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}
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newBalance := oldBalance - cost
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slog.Info("CheckBalanceAfterDeduction: crossing check",
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"user_id", user.ID,
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"old_balance", oldBalance,
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"new_balance", newBalance,
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"effective_threshold", effectiveThreshold,
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"crossed", oldBalance >= effectiveThreshold && newBalance < effectiveThreshold,
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)
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if oldBalance >= effectiveThreshold && newBalance < effectiveThreshold {
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siteName := s.getSiteName(ctx)
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recipients := s.collectBalanceNotifyRecipients(user)
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slog.Info("CheckBalanceAfterDeduction: sending notification",
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"user_id", user.ID,
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"recipients", recipients,
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"new_balance", newBalance,
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"threshold", effectiveThreshold,
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)
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go func() {
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defer func() {
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if r := recover(); r != nil {
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slog.Error("panic in balance notification", "recover", r)
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}
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}()
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s.sendBalanceLowEmails(recipients, user.Username, user.Email, newBalance, effectiveThreshold, siteName, rechargeURL)
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}()
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}
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}
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// quotaDim describes one quota dimension for notification checking.
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type quotaDim struct {
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name string
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enabled bool
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threshold float64
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thresholdType string // "fixed" (default) or "percentage"
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currentUsed float64
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limit float64
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}
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// resolvedThreshold converts the user-facing "remaining" threshold into a usage-based trigger point.
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// The threshold represents how much quota REMAINS when the alert fires:
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// - Fixed ($): threshold=400, limit=1000 → fires when usage reaches 600 (remaining drops to 400)
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// - Percentage (%): threshold=30, limit=1000 → fires when usage reaches 700 (remaining drops to 30%)
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func (d quotaDim) resolvedThreshold() float64 {
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if d.limit <= 0 {
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return 0
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}
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if d.thresholdType == thresholdTypePercentage {
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return d.limit * (1 - d.threshold/100)
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}
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return d.limit - d.threshold
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}
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// buildQuotaDims returns the three quota dimensions for notification checking.
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func buildQuotaDims(account *Account) []quotaDim {
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return []quotaDim{
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{quotaDimDaily, account.GetQuotaNotifyDailyEnabled(), account.GetQuotaNotifyDailyThreshold(), account.GetQuotaNotifyDailyThresholdType(), account.GetQuotaDailyUsed(), account.GetQuotaDailyLimit()},
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{quotaDimWeekly, account.GetQuotaNotifyWeeklyEnabled(), account.GetQuotaNotifyWeeklyThreshold(), account.GetQuotaNotifyWeeklyThresholdType(), account.GetQuotaWeeklyUsed(), account.GetQuotaWeeklyLimit()},
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{quotaDimTotal, account.GetQuotaNotifyTotalEnabled(), account.GetQuotaNotifyTotalThreshold(), account.GetQuotaNotifyTotalThresholdType(), account.GetQuotaUsed(), account.GetQuotaLimit()},
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}
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}
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// CheckAccountQuotaAfterIncrement checks if any quota dimension crossed above its notify threshold.
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// When quotaState is non-nil (from DB transaction RETURNING), it is used directly for threshold
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// checking, avoiding a separate DB read. Otherwise it falls back to fetching fresh account data.
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func (s *BalanceNotifyService) CheckAccountQuotaAfterIncrement(ctx context.Context, account *Account, cost float64, quotaState *AccountQuotaState) {
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if account == nil || s.emailService == nil || s.settingRepo == nil || cost <= 0 {
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return
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}
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if !s.isAccountQuotaNotifyEnabled(ctx) {
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return
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}
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adminEmails := s.getAccountQuotaNotifyEmails(ctx)
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if len(adminEmails) == 0 {
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return
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}
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siteName := s.getSiteName(ctx)
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if quotaState != nil {
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s.checkQuotaDimCrossingsFromState(account, quotaState, cost, adminEmails, siteName)
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return
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}
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freshAccount := s.fetchFreshAccount(ctx, account)
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s.checkQuotaDimCrossings(freshAccount, cost, adminEmails, siteName)
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}
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// fetchFreshAccount loads the latest account from DB; falls back to the snapshot on error.
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func (s *BalanceNotifyService) fetchFreshAccount(ctx context.Context, snapshot *Account) *Account {
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if s.accountRepo == nil {
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return snapshot
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}
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fresh, err := s.accountRepo.GetByID(ctx, snapshot.ID)
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if err != nil {
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slog.Warn("failed to fetch fresh account for quota notify, using snapshot",
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"account_id", snapshot.ID, "error", err)
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return snapshot
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}
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return fresh
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}
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// checkQuotaDimCrossings iterates quota dimensions and sends alerts for threshold crossings.
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// freshAccount has post-increment values; pre-increment is reconstructed as currentUsed - cost.
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func (s *BalanceNotifyService) checkQuotaDimCrossings(freshAccount *Account, cost float64, adminEmails []string, siteName string) {
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for _, dim := range buildQuotaDims(freshAccount) {
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if !dim.enabled || dim.threshold <= 0 {
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continue
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}
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effectiveThreshold := dim.resolvedThreshold()
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if effectiveThreshold <= 0 {
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continue
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}
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// currentUsed is the post-increment value from fresh DB data;
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// reconstruct pre-increment value to detect threshold crossing.
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newUsed := dim.currentUsed
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oldUsed := dim.currentUsed - cost
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if oldUsed < effectiveThreshold && newUsed >= effectiveThreshold {
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s.asyncSendQuotaAlert(adminEmails, freshAccount.ID, freshAccount.Name, freshAccount.Platform, dim, newUsed, effectiveThreshold, siteName)
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}
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}
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}
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// buildQuotaDimsFromState builds quota dimensions using DB transaction state instead of account snapshot.
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// Notification settings (enabled, threshold, thresholdType) come from the account; usage values from quotaState.
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func buildQuotaDimsFromState(account *Account, state *AccountQuotaState) []quotaDim {
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return []quotaDim{
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{quotaDimDaily, account.GetQuotaNotifyDailyEnabled(), account.GetQuotaNotifyDailyThreshold(), account.GetQuotaNotifyDailyThresholdType(), state.DailyUsed, state.DailyLimit},
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{quotaDimWeekly, account.GetQuotaNotifyWeeklyEnabled(), account.GetQuotaNotifyWeeklyThreshold(), account.GetQuotaNotifyWeeklyThresholdType(), state.WeeklyUsed, state.WeeklyLimit},
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{quotaDimTotal, account.GetQuotaNotifyTotalEnabled(), account.GetQuotaNotifyTotalThreshold(), account.GetQuotaNotifyTotalThresholdType(), state.TotalUsed, state.TotalLimit},
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}
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}
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// checkQuotaDimCrossingsFromState checks threshold crossings using DB transaction quota state.
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// This avoids a separate DB read and ensures the values are consistent with the atomic increment.
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func (s *BalanceNotifyService) checkQuotaDimCrossingsFromState(account *Account, state *AccountQuotaState, cost float64, adminEmails []string, siteName string) {
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for _, dim := range buildQuotaDimsFromState(account, state) {
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if !dim.enabled || dim.threshold <= 0 {
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continue
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}
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effectiveThreshold := dim.resolvedThreshold()
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if effectiveThreshold <= 0 {
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continue
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}
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newUsed := dim.currentUsed
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oldUsed := dim.currentUsed - cost
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if oldUsed < effectiveThreshold && newUsed >= effectiveThreshold {
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s.asyncSendQuotaAlert(adminEmails, account.ID, account.Name, account.Platform, dim, newUsed, effectiveThreshold, siteName)
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}
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}
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}
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// asyncSendQuotaAlert sends quota alert email in a goroutine with panic recovery.
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func (s *BalanceNotifyService) asyncSendQuotaAlert(adminEmails []string, accountID int64, accountName, platform string, dim quotaDim, newUsed, effectiveThreshold float64, siteName string) {
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go func() {
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defer func() {
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if r := recover(); r != nil {
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slog.Error("panic in quota notification", "recover", r)
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}
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}()
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s.sendQuotaAlertEmails(adminEmails, accountID, accountName, platform, dim.name, newUsed, dim.limit, effectiveThreshold, siteName)
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}()
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}
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// getBalanceNotifyConfig reads global balance notification settings.
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func (s *BalanceNotifyService) getBalanceNotifyConfig(ctx context.Context) (enabled bool, threshold float64, rechargeURL string) {
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keys := []string{SettingKeyBalanceLowNotifyEnabled, SettingKeyBalanceLowNotifyThreshold, SettingKeyBalanceLowNotifyRechargeURL}
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settings, err := s.settingRepo.GetMultiple(ctx, keys)
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if err != nil {
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return false, 0, ""
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}
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enabled = settings[SettingKeyBalanceLowNotifyEnabled] == "true"
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if v := settings[SettingKeyBalanceLowNotifyThreshold]; v != "" {
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if f, err := strconv.ParseFloat(v, 64); err == nil {
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threshold = f
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}
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}
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rechargeURL = settings[SettingKeyBalanceLowNotifyRechargeURL]
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return
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}
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// isAccountQuotaNotifyEnabled checks the global account quota notification toggle.
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func (s *BalanceNotifyService) isAccountQuotaNotifyEnabled(ctx context.Context) bool {
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val, err := s.settingRepo.GetValue(ctx, SettingKeyAccountQuotaNotifyEnabled)
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if err != nil {
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return false
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}
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return val == "true"
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}
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// getAccountQuotaNotifyEmails reads admin notification emails from settings,
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// filtering out disabled and unverified entries.
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func (s *BalanceNotifyService) getAccountQuotaNotifyEmails(ctx context.Context) []string {
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raw, err := s.settingRepo.GetValue(ctx, SettingKeyAccountQuotaNotifyEmails)
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if err != nil || strings.TrimSpace(raw) == "" || raw == "[]" {
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return nil
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}
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entries := ParseNotifyEmails(raw)
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if len(entries) == 0 {
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return nil
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}
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var recipients []string
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seen := make(map[string]bool)
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for _, entry := range entries {
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if entry.Disabled || !entry.Verified {
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continue
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}
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email := strings.TrimSpace(entry.Email)
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if email == "" {
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continue
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}
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lower := strings.ToLower(email)
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if seen[lower] {
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continue
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}
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seen[lower] = true
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recipients = append(recipients, email)
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}
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return recipients
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}
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// getSiteName reads site name from settings with fallback.
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func (s *BalanceNotifyService) getSiteName(ctx context.Context) string {
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name, err := s.settingRepo.GetValue(ctx, SettingKeySiteName)
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if err != nil || name == "" {
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return "Sub2API"
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}
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return name
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}
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// collectBalanceNotifyRecipients returns verified, non-disabled email recipients.
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// Only emails with verified=true and disabled=false are included.
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func (s *BalanceNotifyService) collectBalanceNotifyRecipients(user *User) []string {
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var recipients []string
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seen := make(map[string]bool)
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for _, entry := range user.BalanceNotifyExtraEmails {
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if entry.Disabled || !entry.Verified {
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continue
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}
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email := strings.TrimSpace(entry.Email)
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if email == "" {
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continue
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}
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lower := strings.ToLower(email)
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if seen[lower] {
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continue
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}
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seen[lower] = true
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recipients = append(recipients, email)
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}
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return recipients
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}
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// sendEmails sends an email to all recipients with shared timeout and error logging.
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func (s *BalanceNotifyService) sendEmails(recipients []string, subject, body string, logAttrs ...any) {
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if len(recipients) == 0 {
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slog.Warn("sendEmails: no recipients", "subject", subject)
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return
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}
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for _, to := range recipients {
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ctx, cancel := context.WithTimeout(context.Background(), emailSendTimeout)
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if err := s.emailService.SendEmail(ctx, to, subject, body); err != nil {
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attrs := append([]any{"to", to, "error", err}, logAttrs...)
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slog.Error("failed to send notification", attrs...)
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} else {
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slog.Info("notification email sent successfully", "to", to, "subject", subject)
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}
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cancel()
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}
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}
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// sendBalanceLowEmails sends balance low notification to all recipients.
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func (s *BalanceNotifyService) sendBalanceLowEmails(recipients []string, userName, userEmail string, balance, threshold float64, siteName, rechargeURL string) {
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displayName := userName
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if displayName == "" {
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displayName = userEmail
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}
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subject := fmt.Sprintf("[%s] 余额不足提醒 / Balance Low Alert", sanitizeEmailHeader(siteName))
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body := s.buildBalanceLowEmailBody(html.EscapeString(displayName), balance, threshold, html.EscapeString(siteName), rechargeURL)
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s.sendEmails(recipients, subject, body, "user_email", userEmail, "balance", balance)
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}
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// sendQuotaAlertEmails sends quota alert notification to admin emails.
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func (s *BalanceNotifyService) sendQuotaAlertEmails(adminEmails []string, accountID int64, accountName, platform, dimension string, used, limit, threshold float64, siteName string) {
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dimLabel := quotaDimLabels[dimension]
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if dimLabel == "" {
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dimLabel = dimension
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}
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subject := fmt.Sprintf("[%s] 账号限额告警 / Account Quota Alert - %s", sanitizeEmailHeader(siteName), sanitizeEmailHeader(accountName))
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body := s.buildQuotaAlertEmailBody(accountID, html.EscapeString(accountName), html.EscapeString(platform), html.EscapeString(dimLabel), used, limit, threshold, html.EscapeString(siteName))
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s.sendEmails(adminEmails, subject, body, "account", accountName, "dimension", dimension)
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}
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// sanitizeEmailHeader removes CR/LF characters to prevent SMTP header injection.
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func sanitizeEmailHeader(s string) string {
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return strings.NewReplacer("\r", "", "\n", "").Replace(s)
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}
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// balanceLowEmailTemplate is the HTML template for balance low notifications.
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// Format args: siteName, userName, userName, balance, threshold, threshold.
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// The recharge button is appended dynamically when rechargeURL is set.
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const balanceLowEmailTemplate = `<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<style>
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body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background-color: #f5f5f5; margin: 0; padding: 20px; }
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.container { max-width: 600px; margin: 0 auto; background-color: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
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.header { background: linear-gradient(135deg, #f59e0b 0%%, #d97706 100%%); color: white; padding: 30px; text-align: center; }
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.header h1 { margin: 0; font-size: 24px; }
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.content { padding: 40px 30px; text-align: center; }
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.balance { font-size: 36px; font-weight: bold; color: #dc2626; margin: 20px 0; }
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.info { color: #666; font-size: 14px; line-height: 1.6; margin-top: 20px; }
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.recharge-btn { display: inline-block; margin-top: 24px; padding: 12px 32px; background: linear-gradient(135deg, #f59e0b 0%%, #d97706 100%%); color: #fff; text-decoration: none; border-radius: 6px; font-size: 16px; font-weight: bold; }
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.footer { background-color: #f8f9fa; padding: 20px; text-align: center; color: #999; font-size: 12px; }
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</style>
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</head>
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<body>
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<div class="container">
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<div class="header"><h1>%s</h1></div>
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<div class="content">
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<p style="font-size: 18px; color: #333;">%s，您的余额不足</p>
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<p style="color: #666;">Dear %s, your balance is running low</p>
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<div class="balance">$%.2f</div>
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<div class="info">
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<p>您的账户余额已低于提醒阈值 <strong>$%.2f</strong>。</p>
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<p>Your account balance has fallen below the alert threshold of <strong>$%.2f</strong>.</p>
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<p>请及时充值以免服务中断。</p>
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<p>Please top up to avoid service interruption.</p>
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</div>
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%s
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</div>
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<div class="footer"><p>此邮件由系统自动发送，请勿回复。</p></div>
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</div>
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</body>
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</html>`
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// quotaAlertEmailTemplate is the HTML template for account quota alert notifications.
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// Format args: siteName, accountID, accountName, platform, dimLabel, used, limitStr, threshold.
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const quotaAlertEmailTemplate = `<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<style>
|
||
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background-color: #f5f5f5; margin: 0; padding: 20px; }
|
||
.container { max-width: 600px; margin: 0 auto; background-color: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
|
||
.header { background: linear-gradient(135deg, #ef4444 0%%, #dc2626 100%%); color: white; padding: 30px; text-align: center; }
|
||
.header h1 { margin: 0; font-size: 24px; }
|
||
.content { padding: 40px 30px; }
|
||
.metric { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid #eee; }
|
||
.metric-label { color: #666; }
|
||
.metric-value { font-weight: bold; color: #333; }
|
||
.info { color: #666; font-size: 14px; line-height: 1.6; margin-top: 20px; text-align: center; }
|
||
.footer { background-color: #f8f9fa; padding: 20px; text-align: center; color: #999; font-size: 12px; }
|
||
</style>
|
||
</head>
|
||
<body>
|
||
<div class="container">
|
||
<div class="header"><h1>%s</h1></div>
|
||
<div class="content">
|
||
<p style="font-size: 18px; color: #333; text-align: center;">账号限额告警 / Account Quota Alert</p>
|
||
<div class="metric"><span class="metric-label">账号 ID / Account ID</span><span class="metric-value">#%d</span></div>
|
||
<div class="metric"><span class="metric-label">账号 / Account</span><span class="metric-value">%s</span></div>
|
||
<div class="metric"><span class="metric-label">平台 / Platform</span><span class="metric-value">%s</span></div>
|
||
<div class="metric"><span class="metric-label">维度 / Dimension</span><span class="metric-value">%s</span></div>
|
||
<div class="metric"><span class="metric-label">已使用 / Used</span><span class="metric-value">$%.2f</span></div>
|
||
<div class="metric"><span class="metric-label">限额 / Limit</span><span class="metric-value">%s</span></div>
|
||
<div class="metric"><span class="metric-label">告警阈值 / Threshold</span><span class="metric-value">$%.2f</span></div>
|
||
<div class="info">
|
||
<p>账号配额用量已达到告警阈值，请及时关注。</p>
|
||
<p>Account quota usage has reached the alert threshold.</p>
|
||
</div>
|
||
</div>
|
||
<div class="footer"><p>此邮件由系统自动发送，请勿回复。</p></div>
|
||
</div>
|
||
</body>
|
||
</html>`
|
||
|
||
// buildBalanceLowEmailBody builds HTML email for balance low notification.
|
||
func (s *BalanceNotifyService) buildBalanceLowEmailBody(userName string, balance, threshold float64, siteName, rechargeURL string) string {
|
||
rechargeBlock := ""
|
||
if rechargeURL != "" {
|
||
rechargeBlock = fmt.Sprintf(`<a href="%s" class="recharge-btn">立即充值 / Top Up Now</a>`, html.EscapeString(rechargeURL))
|
||
}
|
||
return fmt.Sprintf(balanceLowEmailTemplate, siteName, userName, userName, balance, threshold, threshold, rechargeBlock)
|
||
}
|
||
|
||
// buildQuotaAlertEmailBody builds HTML email for account quota alert.
|
||
func (s *BalanceNotifyService) buildQuotaAlertEmailBody(accountID int64, accountName, platform, dimLabel string, used, limit, threshold float64, siteName string) string {
|
||
limitStr := fmt.Sprintf("$%.2f", limit)
|
||
if limit <= 0 {
|
||
limitStr = "无限制 / Unlimited"
|
||
}
|
||
return fmt.Sprintf(quotaAlertEmailTemplate, siteName, accountID, accountName, platform, dimLabel, used, limitStr, threshold)
|
||
}
|
||
|