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// Package fall handles the fallthrough logic used in plugins that support it.
package fall
import (
"github.com/coredns/coredns/plugin"
)
// F can be nil to allow for no fallthrough, empty allow all zones to fallthrough or
// contain a zone list that is checked.
type F []string
// New returns a new F.
func New() *F { return new(F) }
// Through will check if we should fallthrough for qname. Note that we've named the
// variable in each plugin "Fall", so this then reads Fall.Through().
func (f *F) Through(qname string) bool {
if f == nil {
return false
}
if len(*f) == 0 {
return true
}
zone := plugin.Zones(*f).Matches(qname)
return zone != ""
}
// SetZones will set zones in f.
func (f *F) SetZones(zones []string) {
for i := range zones {
zones[i] = plugin.Host(zones[i]).Normalize()
}
*f = zones
}
// Example returns an F with example.org. as the zone name.
var Example = func() *F {
f := F([]string{"example.org."})
return &f
}()
// Zero returns a zero valued F.
var Zero = func() *F {
f := F([]string{})
return &f
}
// IsNil returns true is f is nil.
func (f *F) IsNil() bool { return f == nil }
// IsZero returns true is f is zero (and not nil).
func (f *F) IsZero() bool {
if f == nil {
return false
}
return len(*f) == 0
}
// Equal returns true if f and g are equal. Only useful in tests, The (possible) zones
// are *not* checked.
func (f *F) Equal(g *F) bool {
if f.IsNil() {
if g.IsNil() {
return true
}
return false
}
if f.IsZero() {
if g.IsZero() {
return true
}
}
if len(*f) != len(*g) {
return false
}
return true
}
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