You've already forked ddns-updater
56 lines
1.1 KiB
Go
56 lines
1.1 KiB
Go
package public_resolvers
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"net"
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"net/http"
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)
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var NoIPInResponseError = errors.New("no ip found in response")
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type Doer interface {
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Do(*http.Request) (*http.Response, error)
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}
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type ipParserFunc func(reader io.Reader) (string, error)
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func defaultIpParser(reader io.Reader) (string, error) {
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out, err := io.ReadAll(reader)
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return string(out), err
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}
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type baseResolver struct {
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client Doer
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url string
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ipParser ipParserFunc
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}
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func (i baseResolver) ResolvePublicIp(ctx context.Context) (net.IP, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, i.url, nil)
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if err != nil {
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return net.IP{}, fmt.Errorf("error creating ifconfig request: %w", err)
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}
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resp, err := i.client.Do(req)
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if err != nil {
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return net.IP{}, err
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}
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defer func() {
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_ = resp.Body.Close()
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}()
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if resp.StatusCode != http.StatusOK {
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return net.IP{}, fmt.Errorf("unexpected response code %d", resp.StatusCode)
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}
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ipText, err := i.ipParser(resp.Body)
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if err != nil {
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return net.IP{}, fmt.Errorf("error reading body: %w", err)
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}
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return net.ParseIP(ipText), nil
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}
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