Initial commit

go.mod

@@ -0,0 +1,7 @@
+module github.com/FooSoft/dynhost
+
+go 1.20
+
+require github.com/nrdcg/namesilo v0.2.1
+
+require github.com/google/go-querystring v1.0.0 // indirect

go.sum

@@ -0,0 +1,11 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/google/go-querystring v1.0.0 h1:Xkwi/a1rcvNg1PPYe5vI8GbeBY/jrVuDX5ASuANWTrk=
+github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
+github.com/nrdcg/namesilo v0.2.1 h1:kLjCjsufdW/IlC+iSfAqj0iQGgKjlbUUeDJio5Y6eMg=
+github.com/nrdcg/namesilo v0.2.1/go.mod h1:lwMvfQTyYq+BbjJd30ylEG4GPSS6PII0Tia4rRpRiyw=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=

main.go

@@ -0,0 +1,132 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+
+	"github.com/nrdcg/namesilo"
+)
+
+func updateDns(token, domain, host, address string) error {
+	transport, err := namesilo.NewTokenTransport(token)
+	if err != nil {
+		return err
+	}
+
+	client := namesilo.NewClient(transport.Client())
+
+	var record *namesilo.ResourceRecord
+	{
+		log.Println("querying DNS records...")
+
+		params := &namesilo.DnsListRecordsParams{
+			Domain: domain,
+		}
+
+		dnsListRecords, err := client.DnsListRecords(params)
+		if err != nil {
+			return err
+		}
+
+		for _, r := range dnsListRecords.Reply.ResourceRecord {
+			if r.Host == fmt.Sprintf("%s.%s", host, domain) {
+				record = &r
+				break
+			}
+		}
+	}
+
+	if record == nil {
+		log.Println("adding new DNS record...")
+
+		params := &namesilo.DnsAddRecordParams{
+			Distance: 0,
+			Domain:   domain,
+			Host:     host,
+			TTL:      7200,
+			Type:     "A",
+			Value:    address,
+		}
+
+		if _, err := client.DnsAddRecord(params); err != nil {
+			return err
+		}
+	} else if record.Value != address {
+		log.Println("updating DNS record...")
+
+		params := &namesilo.DnsUpdateRecordParams{
+			Distance: 0,
+			Domain:   domain,
+			Host:     host,
+			ID:       record.RecordID,
+			TTL:      7200,
+			Value:    address,
+		}
+
+		if _, err := client.DnsUpdateRecord(params); err != nil {
+			return err
+		}
+	} else {
+		log.Println("DNS record is current")
+	}
+
+	return nil
+}
+
+func queryAddress() (string, error) {
+	log.Println("querying current address...")
+
+	type response struct {
+		Query string
+	}
+
+	req, err := http.Get("http://ip-api.com/json/")
+	if err != nil {
+		return "", err
+	}
+	defer req.Body.Close()
+
+	body, err := ioutil.ReadAll(req.Body)
+	if err != nil {
+		return "", err
+	}
+
+	var ip response
+	json.Unmarshal(body, &ip)
+
+	return ip.Query, nil
+}
+
+func exec() error {
+	var (
+		token  = os.Getenv("DYN_TOKEN")
+		domain = os.Getenv("DYN_DOMAIN")
+		host   = os.Getenv("DYN_HOST")
+	)
+
+	if len(token) == 0 || len(domain) == 0 || len(host) == 0 {
+		return errors.New("undefined environment")
+	}
+
+	address, err := queryAddress()
+	if err != nil {
+		return err
+	}
+
+	if err := updateDns(token, domain, host, address); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func main() {
+	if err := exec(); err != nil {
+		log.Fatal(err)
+	}
+}