40 lines
863 B
Go
40 lines
863 B
Go
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package updateip
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import "strings"
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// Canonicalize a DNS record.
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func Canonicalize(domainName, recordName string) string {
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if recordName == "@" {
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return ToFqdn(domainName)
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} else if strings.HasSuffix(recordName, ".@") {
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return ToFqdn(strings.TrimSuffix(recordName, "@") + domainName)
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}
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return ToFqdn(recordName)
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}
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// IsFqdn checks if the label is a full-qualified name.
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func IsFqdn(name string) bool {
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return strings.HasSuffix(name, ".")
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}
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// ToFqdn converts the name into a fqdn appending a trailing dot.
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func ToFqdn(name string) string {
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if name == "@" {
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return name
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}
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n := len(name)
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if n == 0 || name[n-1] == '.' {
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return name
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}
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return name + "."
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}
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// UnFqdn converts the fqdn into a name removing the trailing dot.
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func UnFqdn(name string) string {
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n := len(name)
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if n != 0 && name[n-1] == '.' {
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return name[:n-1]
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}
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return name
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}
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