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package oauthclient
import (
"context"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"strings"
)
var ErrNoRevocationEndpoint = errors.New("oauthclient: the authorization server names no revocation endpoint")
type Revocation struct {
Endpoint string
Revoked []string
}
func (s *Session) Revoke(ctx context.Context) (Revocation, error) {
if s == nil {
return Revocation{}, errors.New("oauthclient: no oauth session")
}
s.mu.Lock()
defer s.mu.Unlock()
client := s.client
if client == nil {
client = &http.Client{Timeout: DefaultHTTPTimeout}
}
if s.data.AuthServerRevocationEndpoint == "" {
if _, _, revokeEndpoint, err := DiscoverAuthServer(ctx, client, s.hostURL); err == nil {
s.data.AuthServerRevocationEndpoint = revokeEndpoint
}
}
out := Revocation{Endpoint: s.data.AuthServerRevocationEndpoint}
if out.Endpoint == "" {
return out, ErrNoRevocationEndpoint
}
var errs []error
for _, token := range []struct{ value, hint string }{{s.data.RefreshToken, "refresh_token"}, {s.data.AccessToken, "access_token"}} {
if token.value == "" {
continue
}
if err := s.revokeLocked(ctx, client, out.Endpoint, token.value, token.hint); err != nil {
errs = append(errs, err)
continue
}
out.Revoked = append(out.Revoked, token.hint)
}
return out, errors.Join(errs...)
}
func (s *Session) revokeLocked(ctx context.Context, client *http.Client, endpoint, token, hint string) error {
form := url.Values{"token": {token}, "token_type_hint": {hint}}
if s.data.ClientID != "" {
form.Set("client_id", s.data.ClientID)
}
for attempt := range 2 {
proof, err := DPoPProof(s.key, http.MethodPost, endpoint, "", s.data.DPoPAuthServerNonce)
if err != nil {
return err
}
req, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, strings.NewReader(form.Encode()))
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.Header.Set("Accept", "application/json")
req.Header.Set("DPoP", proof)
resp, err := client.Do(req)
if err != nil {
return fmt.Errorf("oauthclient: revoking the %s: %w", hint, err)
}
raw, _ := io.ReadAll(io.LimitReader(resp.Body, ReplyLimit))
resp.Body.Close()
if nextNonce := resp.Header.Get("DPoP-Nonce"); nextNonce != "" {
s.data.DPoPAuthServerNonce = nextNonce
if attempt == 0 && (resp.StatusCode == http.StatusBadRequest || resp.StatusCode == http.StatusUnauthorized) &&
strings.Contains(string(raw), "use_dpop_nonce") {
continue
}
}
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
return fmt.Errorf("oauthclient: revoking the %s answered HTTP %d", hint, resp.StatusCode)
}
return nil
}
return fmt.Errorf("oauthclient: revoking the %s kept asking for a new DPoP nonce", hint)
}
