middleware/file/wildcard.go


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package file

import "github.com/miekg/dns"

// replaceWithWildcard replaces the left most label with '*'.
func replaceWithAsteriskLabel(qname string) (wildcard string) {
	i, shot := dns.NextLabel(qname, 0)
	if shot {
		return ""
	}

	return "*." + qname[i:]
}