Separate second-factor verification and delivery from auth (#40)

backend/product/twofactor/delivery/email.go

@@ -0,0 +1,23 @@
+package delivery
+
+import (
+	"context"
+	customer "git.sendico.io/tech/sxchnge/product/customers/model"
+	"git.sendico.io/tech/sxchnge/product/notifications"
+	model "git.sendico.io/tech/sxchnge/product/twofactor/model"
+	vmodel "git.sendico.io/tech/sxchnge/product/verification/model"
+	"git.sendico.io/tech/sxchnge/shared/logging/mask"
+)
+
+type Email struct{ Sender notifications.Sender }
+
+func (Email) Channel() model.Channel                   { return model.Email }
+func (Email) Normalize(address string) (string, error) { return customer.NormalizeEmail(address) }
+func (Email) Mask(address string) string               { return mask.Email(address) }
+func (d Email) Send(ctx context.Context, m model.Delivery) error {
+	template := "twofactor.code"
+	if m.Scope.Purpose == vmodel.PurposeLogin {
+		template = "auth.login"
+	}
+	return d.Sender.Send(ctx, notifications.Message{Key: m.Key, UserID: m.Subject.Hex(), Email: m.Factor.Address, Locale: m.Locale, Template: template, Parameters: map[string]string{"code": m.Code}, ExpiresAt: m.ExpiresAt})
+}