fix: get wrong url root domian

go.mod

@@ -14,4 +14,5 @@ require (
 	github.com/pkg/errors v0.8.1
 	github.com/sirupsen/logrus v1.4.2
 	github.com/urfave/cli/v2 v2.0.0
+	golang.org/x/net v0.0.0-20210520170846-37e1c6afe023
 )

go.sum

@@ -0,0 +1,100 @@
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pkg/model/url.go

@@ -1,12 +1,15 @@
 package model
 
 import (
-	"crawlergo/pkg/tools/requests"
 	"errors"
 	"fmt"
 	"net/url"
 	"regexp"
 	"strings"
+
+	"golang.org/x/net/publicsuffix"
+
+	"crawlergo/pkg/tools/requests"
 )
 
 type URL struct {
@@ -122,17 +125,20 @@ func (u *URL) NavigationUrl() string {
 */
 func (u *URL) RootDomain() string {
 	domain := u.Hostname()
-	if strings.Count(domain, ".") == 1 {
-		return domain
+	suffix, icann := publicsuffix.PublicSuffix(strings.ToLower(domain))
+	// 如果不是 icann 的域名，返回空字符串
+	if !icann {
+		return ""
 	}
-
-	parts := strings.Split(domain, ".")
-	if len(parts) >= 2 {
-		parts = parts[len(parts)-2:]
-		return strings.Join(parts, ".")
-	} else {
+	i := len(domain) - len(suffix) - 1
+	// 如果域名错误
+	if i <= 0 {
+		return ""
+	}
+	if domain[i] != '.' {
 		return ""
 	}
+	return domain[1+strings.LastIndex(domain[:i], "."):]
 }
 
 /**

pkg/model/url_test.go

@@ -0,0 +1,45 @@
+package model
+
+import (
+	"net/url"
+	"testing"
+
+	"golang.org/x/net/publicsuffix"
+)
+
+var (
+	rootDomainTestCases = []struct {
+		domain     string
+		rootDomain string
+		wantICANN  bool
+	}{
+		{"www.amazon.co.uk", "amazon.co.uk", true},
+		{"www.baidu.com", "baidu.com", true},
+		{"www.baidu.com.cn", "baidu.com.cn", true},
+		{"www.pku.edu.cn", "pku.edu.cn", true},
+		{"www.example1.debian.org", "debian.org", true},
+		{"www.golang.dev", "golang.dev", true},
+		// 以下都是一些特殊的 case，主要包括一些特殊的域名和私有域名，一般情况遇不到
+		// error domains
+		{"com.cn", "", true},
+		// not an icann domain
+		{"www.example0.debian.net", "", false},
+		{"s3.cn-north-1.amazonaws.com.cn", "", false},
+		{"www.0emm.com", "", false},
+		{"there.is.no.such-tld", "", false},
+	}
+)
+
+func TestRootDomain(t *testing.T) {
+	for _, tc := range rootDomainTestCases {
+		u := &URL{url.URL{Host: tc.domain}}
+		rootDomain := u.RootDomain()
+		_, icann := publicsuffix.PublicSuffix(u.Hostname())
+		if rootDomain != tc.rootDomain {
+			t.Errorf("%s parse root domain failed", tc.domain)
+		}
+		if icann != tc.wantICANN {
+			t.Errorf("%s not an icann domain", tc.domain)
+		}
+	}
+}