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internal/normalize: simplify IP parser; cleanup

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Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I7a860779a4fe49b8034d66f2abd910fc6a6a6964
This commit is contained in:
raf 2026-03-10 09:39:15 +03:00
commit fd3a832f7b
Signed by: NotAShelf
GPG key ID: 29D95B64378DB4BF
2 changed files with 45 additions and 28 deletions
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43
internal/normalize/referrer.go
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@ -1,6 +1,7 @@
package normalize
import (
"net"
"net/url"
"strings"
@ -21,34 +22,20 @@ func isInternalHost(hostname string) bool {
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
// Check if hostname is an IP address
if ip := net.ParseIP(hostname); ip != nil {
// Private IPv4 ranges (RFC1918)
if ip.IsPrivate() {
return true
}
// Additional localhost checks for IP formats
if ip.IsLoopback() {
return true
}
// Link-local addresses
if ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() {
return true
}
}
return false