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package control
import (
"bytes"
"context"
"crypto/rand"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"net/http"
"strings"
"time"
)
const porkbunAPIHost = "https://api.porkbun.com/api/json/v3"
var porkbunAPIHostOverride string
type DNSProvider interface {
EnsureRandomARecord(ctx context.Context, zone, prefix, ip string, ttl int) (string, error)
DeleteARecord(ctx context.Context, zone, name string) error
}
type PorkbunClient struct {
APIKey string
SecretAPIKey string
HTTPClient *http.Client
}
type porkbunResponse struct {
Status string `json:"status"`
Message string `json:"message"`
Records []map[string]any `json:"records"`
ID string `json:"id"`
}
func (c PorkbunClient) EnsureRandomARecord(ctx context.Context, zone, prefix, ip string, ttl int) (string, error) {
if err := c.validate(); err != nil {
return "", err
}
if ttl == 0 {
ttl = 600
}
for range 10 {
name := randomSubdomain(prefix)
records, err := c.retrieveRecordsByNameType(ctx, zone, "A", name)
if err != nil {
return "", err
}
if len(records) > 0 {
continue
}
if err := c.createRecord(ctx, zone, name, "A", ip, ttl); err != nil {
return "", err
}
return name + "." + zone, nil
}
return "", errors.New("failed to allocate unique subdomain")
}
func (c PorkbunClient) DeleteARecord(ctx context.Context, zone, name string) error {
if err := c.validate(); err != nil {
return err
}
return c.deleteByNameType(ctx, zone, "A", name)
}
func (c PorkbunClient) validate() error {
if strings.TrimSpace(c.APIKey) == "" || strings.TrimSpace(c.SecretAPIKey) == "" {
return errors.New("porkbun api keys are not configured")
}
return nil
}
func (c PorkbunClient) createRecord(ctx context.Context, zone, name, recordType, content string, ttl int) error {
payload := map[string]string{
"secretapikey": c.SecretAPIKey,
"apikey": c.APIKey,
"name": name,
"type": recordType,
"content": content,
"ttl": fmt.Sprintf("%d", ttl),
}
_, err := c.post(ctx, "/dns/create/"+zone, payload)
return err
}
func (c PorkbunClient) deleteByNameType(ctx context.Context, zone, recordType, name string) error {
payload := map[string]string{
"secretapikey": c.SecretAPIKey,
"apikey": c.APIKey,
}
_, err := c.post(ctx, "/dns/deleteByNameType/"+zone+"/"+recordType+"/"+name, payload)
return err
}
func (c PorkbunClient) retrieveRecordsByNameType(ctx context.Context, zone, recordType, name string) ([]map[string]any, error) {
payload := map[string]string{
"secretapikey": c.SecretAPIKey,
"apikey": c.APIKey,
}
resp, err := c.post(ctx, "/dns/retrieveByNameType/"+zone+"/"+recordType+"/"+name, payload)
if err != nil {
return nil, err
}
return resp.Records, nil
}
func (c PorkbunClient) post(ctx context.Context, path string, payload map[string]string) (*porkbunResponse, error) {
data, err := json.Marshal(payload)
if err != nil {
return nil, err
}
client := c.HTTPClient
if client == nil {
client = &http.Client{Timeout: 15 * time.Second}
}
baseURL := porkbunAPIHost
if porkbunAPIHostOverride != "" {
baseURL = porkbunAPIHostOverride
}
req, err := http.NewRequestWithContext(ctx, http.MethodPost, baseURL+path, bytes.NewReader(data))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
var out porkbunResponse
if err := json.NewDecoder(resp.Body).Decode(&out); err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("porkbun http %d: %s", resp.StatusCode, out.Message)
}
if strings.ToUpper(out.Status) != "SUCCESS" {
return nil, fmt.Errorf("porkbun api error: %s", out.Message)
}
return &out, nil
}
func randomSubdomain(prefix string) string {
if prefix == "" {
prefix = "vpn"
}
var buf [4]byte
if _, err := rand.Read(buf[:]); err != nil {
now := time.Now().UTC().UnixNano()
return fmt.Sprintf("%s-%x", prefix, now)
}
return prefix + "-" + hex.EncodeToString(buf[:])
}
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