NotAShelf
be4534bac8
Signed-off-by: NotAShelf <raf@notashelf.dev> Change-Id: Ibcaa09bfd4767876ea1cdd5b61c53b476a6a6964
97 lines
2.5 KiB
Go
97 lines
2.5 KiB
Go
package normalize
|
|
|
|
import (
|
|
"net/url"
|
|
"strings"
|
|
|
|
"golang.org/x/net/publicsuffix"
|
|
)
|
|
|
|
// Returns true for localhost, loopback IPs, and private IPs.
|
|
func isInternalHost(hostname string) bool {
|
|
if hostname == "" {
|
|
return false
|
|
}
|
|
|
|
// Localhost variants
|
|
if hostname == "localhost" ||
|
|
strings.HasPrefix(hostname, "localhost.") ||
|
|
strings.HasPrefix(hostname, "127.") ||
|
|
hostname == "::1" {
|
|
return true
|
|
}
|
|
|
|
// Private IPv4 ranges (RFC1918)
|
|
if strings.HasPrefix(hostname, "10.") ||
|
|
strings.HasPrefix(hostname, "192.168.") ||
|
|
strings.HasPrefix(hostname, "172.16.") ||
|
|
strings.HasPrefix(hostname, "172.17.") ||
|
|
strings.HasPrefix(hostname, "172.18.") ||
|
|
strings.HasPrefix(hostname, "172.19.") ||
|
|
strings.HasPrefix(hostname, "172.20.") ||
|
|
strings.HasPrefix(hostname, "172.21.") ||
|
|
strings.HasPrefix(hostname, "172.22.") ||
|
|
strings.HasPrefix(hostname, "172.23.") ||
|
|
strings.HasPrefix(hostname, "172.24.") ||
|
|
strings.HasPrefix(hostname, "172.25.") ||
|
|
strings.HasPrefix(hostname, "172.26.") ||
|
|
strings.HasPrefix(hostname, "172.27.") ||
|
|
strings.HasPrefix(hostname, "172.28.") ||
|
|
strings.HasPrefix(hostname, "172.29.") ||
|
|
strings.HasPrefix(hostname, "172.30.") ||
|
|
strings.HasPrefix(hostname, "172.31.") {
|
|
return true
|
|
}
|
|
|
|
// IPv6 loopback and local
|
|
if strings.HasPrefix(hostname, "::1") ||
|
|
strings.HasPrefix(hostname, "fe80::") ||
|
|
strings.HasPrefix(hostname, "fc00::") ||
|
|
strings.HasPrefix(hostname, "fd00::") {
|
|
return true
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
// Extracts the eTLD+1 domain from a referrer URL.
|
|
// Returns "direct" for empty or same-domain referrers.
|
|
// Returns empty string for invalid URLs.
|
|
func ExtractReferrerDomain(referrer, siteDomain string) string {
|
|
if referrer == "" {
|
|
return "direct"
|
|
}
|
|
|
|
u, err := url.Parse(referrer)
|
|
if err != nil {
|
|
return ""
|
|
}
|
|
|
|
hostname := strings.ToLower(u.Hostname())
|
|
hostname = strings.TrimSuffix(hostname, ".") // remove trailing dot
|
|
if hostname == "" {
|
|
return ""
|
|
}
|
|
|
|
// Check for internal/localhost traffic
|
|
if isInternalHost(hostname) {
|
|
return "internal"
|
|
}
|
|
|
|
// Same domain check
|
|
siteDomainLower := strings.ToLower(siteDomain)
|
|
if hostname == siteDomainLower || strings.HasSuffix(hostname, "."+siteDomainLower) {
|
|
return "direct"
|
|
}
|
|
|
|
// Extract eTLD+1 (effective top-level domain + 1 label); e.g.
|
|
// - "www.google.co.uk" -> "google.co.uk"
|
|
// - "news.ycombinator.com" -> "ycombinator.com"
|
|
eTLDPlus1, err := publicsuffix.EffectiveTLDPlusOne(hostname)
|
|
if err != nil {
|
|
// If public suffix lookup fails, use hostname as-is
|
|
return hostname
|
|
}
|
|
|
|
return eTLDPlus1
|
|
}
|