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package controlplane
import (
"context"
"crypto/hmac"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io"
"log/slog"
"net/http"
"strconv"
"strings"
"time"
"github.com/jackc/pgx/v5"
)
const maxMailFeedbackBytes = 64 << 10
type MailNotificationConfig struct {
LowBalanceMicros int64
SpendAnomalyMultiplier int64
SpendAnomalyMinMicros int64
Interval time.Duration
}
type mailFeedback struct {
EventID string `json:"event_id"`
EventType string `json:"event_type"`
Recipient string `json:"recipient"`
Provider string `json:"provider"`
Detail string `json:"detail"`
}
// MailFeedbackHandler accepts a provider-neutral normalized callback. An edge
// adapter maps the provider's native event into this payload and signs
// "<unix timestamp>.<raw body>" with HMAC-SHA256.
func (s *Store) MailFeedbackHandler(secret string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
w.Header().Set("Allow", http.MethodPost)
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
body, err := io.ReadAll(io.LimitReader(r.Body, maxMailFeedbackBytes+1))
if err != nil || len(body) > maxMailFeedbackBytes || !validMailFeedbackSignature(secret, r.Header.Get("X-AIGW-Mail-Timestamp"), r.Header.Get("X-AIGW-Mail-Signature"), body, time.Now().UTC()) {
http.Error(w, "invalid feedback signature", http.StatusBadRequest)
return
}
var event mailFeedback
decoder := json.NewDecoder(strings.NewReader(string(body)))
decoder.DisallowUnknownFields()
if decoder.Decode(&event) != nil || strings.TrimSpace(event.EventID) == "" ||
!strings.Contains(event.Recipient, "@") || (event.EventType != "delivered" && event.EventType != "bounce" && event.EventType != "complaint") {
http.Error(w, "invalid feedback event", http.StatusBadRequest)
return
}
if err := s.applyMailFeedback(r.Context(), event); err != nil {
http.Error(w, "feedback persistence failed", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
_, _ = io.WriteString(w, "{\"received\":true}\n")
})
}
func validMailFeedbackSignature(secret, timestamp, signature string, body []byte, now time.Time) bool {
if secret == "" || timestamp == "" || !strings.HasPrefix(signature, "sha256=") {
return false
}
seconds, err := strconv.ParseInt(timestamp, 10, 64)
if err != nil || now.Sub(time.Unix(seconds, 0)).Abs() > 5*time.Minute {
return false
}
provided, err := hex.DecodeString(strings.TrimPrefix(signature, "sha256="))
if err != nil {
return false
}
mac := hmac.New(sha256.New, []byte(secret))
_, _ = mac.Write([]byte(timestamp))
_, _ = mac.Write([]byte("."))
_, _ = mac.Write(body)
return hmac.Equal(provided, mac.Sum(nil))
}
func (s *Store) applyMailFeedback(ctx context.Context, event mailFeedback) error {
tx, err := s.db.BeginTx(ctx, pgx.TxOptions{IsoLevel: pgx.ReadCommitted})
if err != nil {
return err
}
defer tx.Rollback(ctx)
tag, err := tx.Exec(ctx, `INSERT INTO mail_feedback_events (event_id,event_type,recipient,provider)
VALUES ($1,$2,lower($3),$4) ON CONFLICT DO NOTHING`, event.EventID, event.EventType, event.Recipient, event.Provider)
if err != nil || tag.RowsAffected() == 0 {
if err != nil {
return err
}
return tx.Commit(ctx)
}
if event.EventType == "bounce" || event.EventType == "complaint" {
detail := event.Detail
if len(detail) > 1000 {
detail = detail[:1000]
}
if _, err := tx.Exec(ctx, `INSERT INTO mail_suppressions
(recipient,reason,provider,provider_event_id,detail) VALUES (lower($1),$2,$3,$4,$5)
ON CONFLICT (recipient) DO UPDATE SET reason=EXCLUDED.reason,provider=EXCLUDED.provider,
provider_event_id=EXCLUDED.provider_event_id,detail=EXCLUDED.detail,updated_at=now()`,
event.Recipient, event.EventType, event.Provider, event.EventID, detail); err != nil {
return err
}
if _, err := tx.Exec(ctx, `UPDATE console_mail_outbox SET status='suppressed',last_error=$2,claimed_at=NULL
WHERE lower(recipient)=lower($1) AND status IN ('pending','retry','sending')`, event.Recipient, "recipient suppressed after "+event.EventType); err != nil {
return err
}
}
return tx.Commit(ctx)
}
func (s *Store) RunMailNotificationWorker(ctx context.Context, config MailNotificationConfig, logger *slog.Logger) {
if config.Interval <= 0 {
config.Interval = 5 * time.Minute
}
if logger == nil {
logger = slog.Default()
}
ticker := time.NewTicker(config.Interval)
defer ticker.Stop()
for {
if err := s.queueBillingNotifications(ctx, config); err != nil && !errors.Is(err, context.Canceled) {
logger.Warn("billing_notification_scan_failed", "error", err)
}
select {
case <-ctx.Done():
return
case <-ticker.C:
}
}
}
func (s *Store) queueBillingNotifications(ctx context.Context, config MailNotificationConfig) error {
rows, err := s.db.Query(ctx, `WITH spend AS (
SELECT tenant_id,
COALESCE(sum(-amount_micros) FILTER (WHERE kind='usage' AND created_at>=date_trunc('day',now())),0)::bigint today,
(COALESCE(sum(-amount_micros) FILTER (WHERE kind='usage' AND created_at>=date_trunc('day',now())-interval '7 days' AND created_at<date_trunc('day',now())),0)/7)::bigint baseline
FROM billing_ledger GROUP BY tenant_id)
SELECT w.tenant_id::text,w.currency,w.balance_micros-w.reserved_micros,u.email,u.display_name,
COALESCE(spend.today,0),COALESCE(spend.baseline,0)
FROM tenant_wallets w JOIN console_users u ON u.tenant_id=w.tenant_id
LEFT JOIN spend ON spend.tenant_id=w.tenant_id
WHERE u.status='active' AND u.email_verified_at IS NOT NULL AND u.role IN ('tenant_admin','tenant_billing')
AND NOT EXISTS (SELECT 1 FROM mail_suppressions s WHERE lower(s.recipient)=lower(u.email))`)
if err != nil {
return err
}
defer rows.Close()
for rows.Next() {
var tenantID, currency, email, name string
var available, today, baseline int64
if err := rows.Scan(&tenantID, ¤cy, &available, &email, &name, &today, &baseline); err != nil {
return err
}
day := time.Now().UTC().Format("2006-01-02")
if available <= config.LowBalanceMicros {
body := fmt.Sprintf("Hi %s,\n\nYour AIGW prepaid balance is low: %.6f %s remains available. Add funds to avoid interrupted API access.\n", displayName(name), float64(available)/1_000_000, strings.ToUpper(currency))
if err := s.queueNotification(ctx, tenantID, email, "low_balance", day, "AIGW balance is low", body); err != nil {
return err
}
}
if baseline > 0 && today >= config.SpendAnomalyMinMicros && today >= baseline*config.SpendAnomalyMultiplier {
body := fmt.Sprintf("Hi %s,\n\nAIGW detected unusual API spend today: %.6f %s versus a seven-day daily baseline of %.6f %s. Review API keys and usage in the console.\n", displayName(name), float64(today)/1_000_000, strings.ToUpper(currency), float64(baseline)/1_000_000, strings.ToUpper(currency))
if err := s.queueNotification(ctx, tenantID, email, "spend_anomaly", day, "Unusual AIGW API spend detected", body); err != nil {
return err
}
}
}
return rows.Err()
}
func (s *Store) queueNotification(ctx context.Context, tenantID, recipient, kind, dedupe, subject, body string) error {
tx, err := s.db.BeginTx(ctx, pgx.TxOptions{IsoLevel: pgx.ReadCommitted})
if err != nil {
return err
}
defer tx.Rollback(ctx)
tag, err := tx.Exec(ctx, `INSERT INTO mail_notification_events (tenant_id,recipient,notification_type,dedupe_key)
VALUES ($1,lower($2),$3,$4) ON CONFLICT DO NOTHING`, tenantID, recipient, kind, dedupe)
if err != nil || tag.RowsAffected() == 0 {
if err != nil {
return err
}
return tx.Commit(ctx)
}
ciphertext, err := s.cipher.Encrypt(body)
if err != nil {
return err
}
if _, err := tx.Exec(ctx, `INSERT INTO console_mail_outbox (recipient,template,subject,body_ciphertext)
VALUES (lower($1),$2,$3,$4)`, recipient, kind, subject, ciphertext); err != nil {
return err
}
return tx.Commit(ctx)
}
func displayName(value string) string {
if value = strings.TrimSpace(value); value != "" {
return value
}
return "there"
}
|
