Fix push expiration handling

push/buford/buford.go

@@ -19,7 +19,7 @@ type NewClient func(*tls.Certificate) (*http.Client, error)
 // bufordFactory instantiates new buford Services to satisfy the PushProviderFactory interface.
 type bufordFactory struct {
 	workers           uint
-	expiration        time.Time
+	expiration        time.Duration
 	newClientCallback NewClient
 }
 
@@ -34,7 +34,7 @@ func WithWorkers(workers uint) Option {
 }
 
 // WithExpiration sets the APNs expiration time for the push notifications.
-func WithExpiration(expiration time.Time) Option {
+func WithExpiration(expiration time.Duration) Option {
 	return func(f *bufordFactory) {
 		f.expiration = expiration
 	}