feat: resolve payment results by resume token

backend/internal/service/payment_resume_lookup.go

@@ -0,0 +1,35 @@
+package service
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	dbent "github.com/Wei-Shaw/sub2api/ent"
+)
+
+func (s *PaymentService) GetPublicOrderByResumeToken(ctx context.Context, token string) (*dbent.PaymentOrder, error) {
+	claims, err := s.paymentResume().ParseToken(strings.TrimSpace(token))
+	if err != nil {
+		return nil, err
+	}
+
+	order, err := s.entClient.PaymentOrder.Get(ctx, claims.OrderID)
+	if err != nil {
+		return nil, fmt.Errorf("get order by resume token: %w", err)
+	}
+	if claims.UserID > 0 && order.UserID != claims.UserID {
+		return nil, fmt.Errorf("resume token user mismatch")
+	}
+	if claims.ProviderInstanceID != "" && strings.TrimSpace(psStringValue(order.ProviderInstanceID)) != claims.ProviderInstanceID {
+		return nil, fmt.Errorf("resume token provider instance mismatch")
+	}
+	if claims.ProviderKey != "" && strings.TrimSpace(psStringValue(order.ProviderKey)) != claims.ProviderKey {
+		return nil, fmt.Errorf("resume token provider key mismatch")
+	}
+	if claims.PaymentType != "" && strings.TrimSpace(order.PaymentType) != claims.PaymentType {
+		return nil, fmt.Errorf("resume token payment type mismatch")
+	}
+
+	return order, nil
+}