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|
package provider
import (
"errors"
"fmt"
"io"
"log/slog"
"net/http"
"net/netip"
"os"
"strings"
"time"
)
type Kind string
const (
// only the generic dummy testing provider for now
KindDummy Kind = "dummy"
)
type RecordType string
const (
TypeA RecordType = "A"
TypeAAAA RecordType = "AAAA"
)
type Config struct {
Kind Kind `json:"kind"`
// exactly one of these supplies the api key.
// both expand any $environment variables!
Key string `json:"key,omitempty"`
KeyFile string `json:"keyFile,omitempty"`
}
func (c Config) key() (string, error) {
if (c.Key == "") == (c.KeyFile == "") {
return "", errors.New("exactly one of key or keyFile must be set")
}
if c.Key != "" {
key := os.ExpandEnv(c.Key)
if key == "" {
return "", fmt.Errorf("key %q expanded to nothing", c.Key)
}
return key, nil
}
// expand those environment variables
raw, err := os.ReadFile(os.ExpandEnv(c.KeyFile))
if err != nil {
return "", err
}
return strings.TrimSpace(string(raw)), nil
}
type Provider interface {
// Ensure makes name.zone of the given type point at addr,
// creating the record when it doesn't exist yet.
// Returns the previous value (if any) and whether anything was changed.
Ensure(zone, name string, rtype RecordType, addr netip.Addr) (string, bool, error)
}
func New(log *slog.Logger, cfg Config) (Provider, error) {
switch cfg.Kind {
case KindDummy:
return newDummy(log)
default:
return nil, fmt.Errorf("unknown provider kind %q", cfg.Kind)
}
}
var client = http.Client{Timeout: 30 * time.Second}
// generic request sending helper, since most providers will need it.
func request(method, url string, headers map[string]string, body io.Reader) ([]byte, error) {
req, err := http.NewRequest(method, url, body)
if err != nil {
return nil, err
}
for k, v := range headers {
req.Header.Set(k, v)
}
if body != nil {
req.Header.Set("Content-Type", "application/json")
}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
raw, err := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
if err != nil {
return nil, err
}
if resp.StatusCode < 200 || resp.StatusCode > 299 {
return nil, fmt.Errorf("%s %s: %s: %.200s", method, url, resp.Status, raw)
}
return raw, nil
}
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