Fix expires label

internal/server/pages.go

@@ -48,10 +48,14 @@ type indexPage struct {
 	MaxSize       string
 	MaxExpiry     string
 	DefaultExpiry string
-	AbsBase       string
-	AllowVanity   bool
-	MaxSizeBytes  int64 // 0 when unlimited; the script checks against it
-	Stale         bool  // a login whose token no longer exists
+	// ExpiryHint is the same lifetime as DefaultExpiry, worded for the form's
+	// "Expires in" field rather than for a row in the limits list: what the
+	// field wants is "never", what the list wants is "unlimited".
+	ExpiryHint   string
+	AbsBase      string
+	AllowVanity  bool
+	MaxSizeBytes int64 // 0 when unlimited; the script checks against it
+	Stale        bool  // a login whose token no longer exists
 }
 
 func (s *Server) handleIndex(w http.ResponseWriter, r *http.Request) {
@@ -71,6 +75,7 @@ func (s *Server) handleIndex(w http.ResponseWriter, r *http.Request) {
 		MaxSize:       config.FormatSize(lim.MaxSize),
 		MaxExpiry:     config.FormatLifetime(lim.MaxExpiry),
 		DefaultExpiry: config.FormatLifetime(lim.DefaultExpiry),
+		ExpiryHint:    config.FormatDuration(lim.DefaultExpiry),
 		AbsBase:       s.absBase(r),
 		AllowVanity:   lim.AllowVanity,
 		MaxSizeBytes:  lim.MaxSize,