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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:generate go run gen.go
// Package publicsuffix provides a public suffix list based on data from
// http://publicsuffix.org/. A public suffix is one under which Internet users
// can directly register names.
package publicsuffix // import "golang.org/x/net/publicsuffix"
// TODO: specify case sensitivity and leading/trailing dot behavior for
// func PublicSuffix and func EffectiveTLDPlusOne.
import (
"fmt"
"net/http/cookiejar"
"strings"
)
// List implements the cookiejar.PublicSuffixList interface by calling the
// PublicSuffix function.
var List cookiejar.PublicSuffixList = list{}
type list struct{}
func (list) PublicSuffix(domain string) string {
ps, _ := PublicSuffix(domain)
return ps
}
func (list) String() string {
return version
}
// PublicSuffix returns the public suffix of the domain using a copy of the
// publicsuffix.org database compiled into the library.
//
// icann is whether the public suffix is managed by the Internet Corporation
// for Assigned Names and Numbers. If not, the public suffix is privately
// managed. For example, foo.org and foo.co.uk are ICANN domains,
// foo.dyndns.org and foo.blogspot.co.uk are private domains.
//
// Use cases for distinguishing ICANN domains like foo.com from private
// domains like foo.appspot.com can be found at
// https://wiki.mozilla.org/Public_Suffix_List/Use_Cases
func PublicSuffix(domain string) (publicSuffix string, icann bool) {
lo, hi := uint32(0), uint32(numTLD)
s, suffix, wildcard := domain, len(domain), false
loop:
for {
dot := strings.LastIndex(s, ".")
if wildcard {
suffix = 1 + dot
}
if lo == hi {
break
}
f := find(s[1+dot:], lo, hi)
if f == notFound {
break
}
u := nodes[f] >> (nodesBitsTextOffset + nodesBitsTextLength)
icann = u&(1<<nodesBitsICANN-1) != 0
u >>= nodesBitsICANN
u = children[u&(1<<nodesBitsChildren-1)]
lo = u & (1<<childrenBitsLo - 1)
u >>= childrenBitsLo
hi = u & (1<<childrenBitsHi - 1)
u >>= childrenBitsHi
switch u & (1<<childrenBitsNodeType - 1) {
case nodeTypeNormal:
suffix = 1 + dot
case nodeTypeException:
suffix = 1 + len(s)
break loop
}
u >>= childrenBitsNodeType
wildcard = u&(1<<childrenBitsWildcard-1) != 0
if dot == -1 {
break
}
s = s[:dot]
}
if suffix == len(domain) {
// If no rules match, the prevailing rule is "*".
return domain[1+strings.LastIndex(domain, "."):], icann
}
return domain[suffix:], icann
}
const notFound uint32 = 1<<32 - 1
// find returns the index of the node in the range [lo, hi) whose label equals
// label, or notFound if there is no such node. The range is assumed to be in
// strictly increasing node label order.
func find(label string, lo, hi uint32) uint32 {
for lo < hi {
mid := lo + (hi-lo)/2
s := nodeLabel(mid)
if s < label {
lo = mid + 1
} else if s == label {
return mid
} else {
hi = mid
}
}
return notFound
}
// nodeLabel returns the label for the i'th node.
func nodeLabel(i uint32) string {
x := nodes[i]
length := x & (1<<nodesBitsTextLength - 1)
x >>= nodesBitsTextLength
offset := x & (1<<nodesBitsTextOffset - 1)
return text[offset : offset+length]
}
// EffectiveTLDPlusOne returns the effective top level domain plus one more
// label. For example, the eTLD+1 for "foo.bar.golang.org" is "golang.org".
func EffectiveTLDPlusOne(domain string) (string, error) {
suffix, _ := PublicSuffix(domain)
if len(domain) <= len(suffix) {
return "", fmt.Errorf("publicsuffix: cannot derive eTLD+1 for domain %q", domain)
}
i := len(domain) - len(suffix) - 1
if domain[i] != '.' {
return "", fmt.Errorf("publicsuffix: invalid public suffix %q for domain %q", suffix, domain)
}
return domain[1+strings.LastIndex(domain[:i], "."):], nil
}