forked from goccy/go-zetasqlite
/
function_net.go
165 lines (150 loc) · 3.9 KB
/
function_net.go
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package internal
import (
"encoding/binary"
"fmt"
"golang.org/x/net/idna"
"golang.org/x/net/publicsuffix"
"net"
"net/netip"
"net/url"
"regexp"
"strings"
)
func NET_HOST(v string) (Value, error) {
parsed := parseURL(v)
if parsed == nil {
return nil, nil
}
hostname := parsed.Hostname()
if hostname == "" {
return nil, nil
}
if strings.HasPrefix(parsed.Host, "[") {
return StringValue("[" + hostname + "]"), nil
}
return StringValue(hostname), nil
}
func NET_IP_FROM_STRING(v string) (Value, error) {
ip, err := parseIP(v)
if err != nil {
return nil, fmt.Errorf("NET.IP_FROM_STRING: invalid ip address %v", v)
}
return BytesValue(ip), nil
}
func NET_IP_NET_MASK(output, prefix int64) (Value, error) {
result := net.CIDRMask(int(prefix), int(output)*8)
if output != 4 && output != 16 {
return nil, fmt.Errorf("NET.IP_NET_MASK: the first argument must be either 4 or 16")
}
if prefix < 0 || prefix > output*8 {
return nil, fmt.Errorf("NET.IP_NET_MASK: the second argument must be in the range from 0 to %d", output*8)
}
return BytesValue(result), nil
}
func NET_IP_TO_STRING(v []byte) (Value, error) {
ip, ok := netip.AddrFromSlice(v)
if !ok {
return nil, fmt.Errorf("NET.IP_TO_STRING: invalid byte array")
}
return StringValue(ip.String()), nil
}
func NET_IP_TRUNC(v []byte, length int64) (Value, error) {
if len(v) != 4 && len(v) != 16 {
return nil, fmt.Errorf("NET.IP_TRUNC: length of the first argument must be either 4 or 16")
}
if length < 0 || int(length) > len(v)*8 {
return nil, fmt.Errorf("NET.IP_TRUNC: length must be in the range from 0 to %d", len(v)*8)
}
ip := net.IP(v)
mask := net.CIDRMask(int(length), len(v)*8)
return BytesValue(ip.Mask(mask)), nil
}
func NET_IPV4_FROM_INT64(v int64) (Value, error) {
ip := make([]byte, 4)
binary.BigEndian.PutUint32(ip, uint32(v))
return BytesValue(ip), nil
}
func NET_IPV4_TO_INT64(v []byte) (Value, error) {
if len(v) != 4 {
return nil, fmt.Errorf("NET.IPV4_TO_INT64: length of bytes array must be 4")
}
return IntValue(binary.BigEndian.Uint32(v)), nil
}
func NET_PUBLIC_SUFFIX(v string) (Value, error) {
parsed := parseURL(v)
if parsed == nil {
return nil, nil
}
host := parsed.Hostname()
suffix, err := publicSuffix(host)
if err != nil {
return nil, fmt.Errorf("NET.PUBLIC_SUFFIX: invalid hostname %s", host)
}
if suffix == "" {
return nil, nil
}
return StringValue(suffix), nil
}
func NET_REG_DOMAIN(v string) (Value, error) {
parsed := parseURL(v)
if parsed == nil {
return nil, nil
}
host := parsed.Hostname()
splitHost := strings.Split(host, ".")
suffix, err := publicSuffix(host)
if err != nil {
return nil, fmt.Errorf("NET.REG_DOMAIN: invalid hostname %s", host)
}
splitSuffix := strings.Split(suffix, ".")
if host == "" || suffix == "" || len(splitHost) <= len(splitSuffix) {
return nil, nil
}
return StringValue(strings.Join(splitHost[len(splitHost)-len(splitSuffix)-1:], ".")), nil
}
func NET_SAFE_IP_FROM_STRING(v string) (Value, error) {
ip, err := parseIP(v)
if err != nil {
return nil, nil
}
return BytesValue(ip), nil
}
func parseURL(v string) *url.URL {
parsed, err := url.Parse(v)
if err != nil {
return nil
}
if parsed.Host == "" {
parsed, err = url.Parse("//" + strings.TrimSpace(v))
if err != nil {
return nil
}
}
return parsed
}
var (
publicSuffixMatcher = regexp.MustCompile(`[^.]\.{2,}[^.]`)
)
func publicSuffix(host string) (string, error) {
if publicSuffixMatcher.MatchString(host) {
return "", nil
}
splitHost := strings.Split(host, ".")
encoded, err := idna.ToASCII(strings.ToLower(host))
if err != nil {
return "", err
}
suffix, icann := publicsuffix.PublicSuffix(encoded)
if !icann {
return "", nil
}
splitSuffix := strings.Split(suffix, ".")
return strings.Join(splitHost[len(splitHost)-len(splitSuffix):], "."), nil
}
func parseIP(v string) ([]byte, error) {
ip, err := netip.ParseAddr(v)
if err != nil {
return nil, err
}
return ip.AsSlice(), nil
}