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is_domain.go
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/
is_domain.go
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package isdomain
import (
"strings"
)
//go:generate bash regenerate-tlds.sh
// IsICANNTLD returns whether the given string is a TLD (Top Level Domain),
// according to ICANN. Well, really according to the TLDs listed in this
// package.
func IsICANNTLD(s string) bool {
s = strings.ToUpper(s)
_, found := TLDs[s]
return found
}
// IsExtendedTLD returns whether the given string is a TLD (Top Level Domain),
// extended with a few other "TLDs": .bit, .onion
func IsExtendedTLD(s string) bool {
s = strings.ToUpper(s)
_, found := ExtendedTLDs[s]
return found
}
// IsTLD returns whether the given string is a TLD (according to ICANN, or
// in the set of ExtendedTLDs listed in this package.
func IsTLD(s string) bool {
return IsICANNTLD(s) || IsExtendedTLD(s)
}
// IsDomain returns whether given string is a domain.
// It first checks the TLD, and then uses a regular expression.
func IsDomain(s string) bool {
if strings.HasSuffix(s, ".") {
s = s[:len(s)-1]
}
split := strings.Split(s, ".")
// Need a TLD and a domain.
if len(split) < 2 {
return false
}
// Check the TLD
tld := split[len(split)-1]
if !IsTLD(tld) {
return false
}
// Check the domain.
s = strings.ToLower(s)
return domainRegexp.MatchString(s)
}