38 lines
654 B
Go
38 lines
654 B
Go
package main
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import (
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"fmt"
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"os"
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"strings"
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"golang.org/x/net/publicsuffix"
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)
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func main() {
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if len(os.Args) != 2 {
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fmt.Fprintf(os.Stderr, "Usage: %s <domain>\n", os.Args[0])
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os.Exit(1)
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}
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domain := strings.TrimSpace(os.Args[1])
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if domain == "" {
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fmt.Println("invalid")
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os.Exit(1)
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}
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// Get the effective TLD+1 (registrable domain)
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etld1, err := publicsuffix.EffectiveTLDPlusOne(domain)
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if err != nil {
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fmt.Println("invalid")
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os.Exit(1)
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}
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// If the domain is exactly the effective TLD+1, it's a valid domain
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// If it's longer, it's a subdomain
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if domain == etld1 {
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fmt.Println("valid")
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} else {
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fmt.Println("sub")
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}
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}
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