violet/utils/domain-utils.go

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package utils
import (
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"strconv"
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"strings"
)
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// SplitDomainPort takes an input host and default port then outputs the domain,
// port and true or empty values and false if the split failed
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func SplitDomainPort(host string, defaultPort int) (domain string, port int, ok bool) {
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a := strings.SplitN(host, ":", 2)
switch len(a) {
case 2:
domain = a[0]
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p, err := strconv.Atoi(a[1])
port = p
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ok = err == nil
case 1:
domain = a[0]
port = defaultPort
ok = true
}
return
}
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// GetDomainWithoutPort takes an input domain + port and outputs the domain
// without the port.
//
// example.com:443 => example.com
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func GetDomainWithoutPort(domain string) string {
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// if a valid index isn't found then return false
n := strings.LastIndexByte(domain, ':')
if n == -1 {
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return domain
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}
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return domain[:n]
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}
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// ReplaceSubdomainWithWildcard returns the domain with the subdomain replaced
// with a wildcard '*' character.
//
// www.example.com => *.example.com
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func ReplaceSubdomainWithWildcard(domain string) (string, bool) {
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// if a valid index isn't found then return false
n := strings.IndexByte(domain, '.')
if n == -1 {
return "", false
}
return "*" + domain[n:], true
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}
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// GetParentDomain returns the parent domain stripping off the subdomain.
//
// www.example.com => example.com
func GetParentDomain(domain string) (string, bool) {
// if a valid index isn't found then return false
n := strings.IndexByte(domain, '.')
if n == -1 {
return "", false
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}
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return domain[n+1:], true
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}
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// GetTopFqdn returns the top domain stripping off multiple layers of subdomains.
//
// hello.world.example.com => example.com
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func GetTopFqdn(domain string) (string, bool) {
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var countDot int
n := strings.LastIndexFunc(domain, func(r rune) bool {
// return true if this is the second '.'
// otherwise counts one and continues
if r == '.' {
if countDot == 1 {
return true
}
countDot++
}
return false
})
// if a valid index isn't found then return false
if n == -1 {
return "", false
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}
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return domain[n+1:], true
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}