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cloudflare.go
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cloudflare.go
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package main
import (
"encoding/json"
"errors"
"log"
"net/http"
"net/url"
"strings"
"time"
)
func NewCloudflareCli(timeout time.Duration) DnsQueryer {
return &cloudflareCli{
cli: &http.Client{Timeout: timeout},
}
}
type cloudflareCli struct {
cli *http.Client
}
type CloudflareAnswer struct {
TTL uint32 `json:"TTL"`
Data string `json:"data"`
Name string `json:"name"`
Type int `json:"type"`
}
type CloudflareQuestion struct {
Name string `json:"name"`
Type int `json:"type"`
}
// https://developers.cloudflare.com/1.1.1.1/dns-over-https/json-format/
type CloudflareDnsRet struct {
AD bool `json:"AD"`
Answer []CloudflareAnswer `json:"Answer"`
CD bool `json:"CD"`
Question []CloudflareQuestion `json:"Question"`
RA bool `json:"RA"`
RD bool `json:"RD"`
Status int `json:"Status"`
TC bool `json:"TC"`
}
func (d *cloudflareCli) Query(domain string) (info *TTLInfo) {
info = &TTLInfo{
Domain: domain,
TTLTo: time.Now().Add(time.Second * 3),
}
if strings.HasSuffix(domain, ".") {
domain = domain[:len(domain)-1]
}
query := url.Values{}
query.Set("name", domain)
query.Set("type", "A")
u := "https://1.1.1.1/dns-query?" + query.Encode()
req, err := http.NewRequest("GET", u, nil)
if err != nil {
log.Println("req", err)
info.Err = err
return
}
req.Header.Set("accept", "application/dns-json")
resp, err := d.cli.Do(req)
if err != nil || resp.StatusCode != 200 {
log.Println("get", err)
info.Err = err
return
}
defer resp.Body.Close()
var ret CloudflareDnsRet
err = json.NewDecoder(resp.Body).Decode(&ret)
if err != nil {
log.Println("decode", err)
info.Err = err
return
}
if ret.Status != 0 || len(ret.Answer) == 0 {
err = errors.New("query failed")
log.Println(err)
info.Err = err
return
}
for _, ans := range ret.Answer {
if ans.Type != 1 {
continue
}
if ans.TTL > 3600 {
ans.TTL = 3600
}
if ans.TTL <= 0 {
ans.TTL = 3
}
info.TTL = ans.TTL
info.Domain = domain + "."
info.TTLTo = time.Now().Add(time.Second * time.Duration(ans.TTL))
info.Records = append(info.Records, ans.Data)
}
return
}