135 lines
2.3 KiB
Go
135 lines
2.3 KiB
Go
package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"github.com/nrdcg/namesilo"
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)
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func updateDns(token, domain, host, address string) error {
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transport, err := namesilo.NewTokenTransport(token)
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if err != nil {
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return err
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}
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client := namesilo.NewClient(transport.Client())
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var record *namesilo.ResourceRecord
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{
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log.Println("querying DNS records...")
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params := &namesilo.DnsListRecordsParams{
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Domain: domain,
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}
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dnsListRecords, err := client.DnsListRecords(params)
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if err != nil {
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return err
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}
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for _, r := range dnsListRecords.Reply.ResourceRecord {
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if r.Host == fmt.Sprintf("%s.%s", host, domain) {
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record = &r
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break
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}
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}
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}
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if record == nil {
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log.Println("adding new DNS record...")
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params := &namesilo.DnsAddRecordParams{
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Distance: 0,
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Domain: domain,
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Host: host,
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TTL: 7200,
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Type: "A",
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Value: address,
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}
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if _, err := client.DnsAddRecord(params); err != nil {
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return err
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}
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} else if record.Value != address {
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log.Println("updating DNS record...")
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params := &namesilo.DnsUpdateRecordParams{
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Distance: 0,
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Domain: domain,
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Host: host,
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ID: record.RecordID,
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TTL: 7200,
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Value: address,
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}
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if _, err := client.DnsUpdateRecord(params); err != nil {
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return err
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}
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} else {
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log.Println("DNS record is current")
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}
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return nil
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}
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func queryAddress() (string, error) {
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log.Println("querying current address...")
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type response struct {
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Query string
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}
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req, err := http.Get("http://ip-api.com/json/")
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if err != nil {
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return "", err
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}
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defer req.Body.Close()
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body, err := ioutil.ReadAll(req.Body)
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if err != nil {
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return "", err
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}
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var ip response
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if err := json.Unmarshal(body, &ip); err != nil {
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return "", err
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}
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return ip.Query, nil
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}
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func exec() error {
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var (
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token = os.Getenv("DYN_TOKEN")
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domain = os.Getenv("DYN_DOMAIN")
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host = os.Getenv("DYN_HOST")
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)
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if len(token) == 0 || len(domain) == 0 || len(host) == 0 {
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return errors.New("undefined environment")
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}
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address, err := queryAddress()
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if err != nil {
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return err
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}
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if err := updateDns(token, domain, host, address); err != nil {
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return err
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}
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return nil
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}
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func main() {
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if err := exec(); err != nil {
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log.Fatal(err)
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}
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}
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