Convert Netlify DNS JSON export to a DNS zone file. Fork of https://github.com/Samyak2/netlify-dns-zone-file.

main.go

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"os"
	"strings"
)

type DnsZone struct {
	Id      string      `json:"id"`
	Name    string      `json:"name"`
	Records []DnsRecord `json:"records"`
}

type DnsRecord struct {
	ID        string  `json:"id"`
	DnsZoneID string  `json:"dns_zone_id"`
	Hostname  string  `json:"hostname"`
	Type      string  `json:"type"`
	TTL       int     `json:"ttl"`
	Priority  int     `json:"priority"`
	Weight    *int    `json:"weight,omitempty"`
	Port      *int    `json:"port,omitempty"`
	Flag      *string `json:"flag,omitempty"`
	Tag       *string `json:"tag,omitempty"`
	Managed   bool    `json:"managed"`
	Value     string  `json:"value"`
}

func GenerateZoneFile(zone DnsZone) (string, error) {
	records := zone.Records
	var zoneFile strings.Builder

	zoneFile.WriteString(fmt.Sprintf("$ORIGIN %s\n", zone.Name+"."))

	for _, record := range records {
		if record.Type == "NETLIFY" {
			fmt.Printf("ingoring NETLIFY record: %s\n", record.Hostname)
			continue
		}

		name := record.Hostname + "."
		value := record.Value

		var priority = ""
		if record.Priority != 0 {
			priority = fmt.Sprintf("\t%d", record.Priority)
		}

		zoneFile.WriteString(
			fmt.Sprintf(
				"%s\tIN\t%d\t%s%s\t%s\n",
				name,
				record.TTL,
				record.Type,
				priority,
				value,
			),
		)
	}

	return zoneFile.String(), nil
}

func main() {
	netlifyZonesFile, err := os.ReadFile("dns-zones.json")
	if err != nil {
		log.Fatalln(err)
	}

	var zones []DnsZone
	if err := json.Unmarshal(netlifyZonesFile, &zones); err != nil {
		log.Fatalln(err)
	}

	for _, zone := range zones {
		zoneContents, err := GenerateZoneFile(zone)
		if err != nil {
			log.Fatalln(err)
		}

		fileName := zone.Id + ".zone"

		err = os.WriteFile(fileName, []byte(zoneContents), 0644)
		if err != nil {
			log.Fatalln(err)
		}

		fmt.Println(fileName)
	}
}