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import ( "context" "encoding/json" "fmt" "time"
"tangled.org/core/appview/cache")
type OAuthSession struct { Handle string Did string PdsUrl string AccessJwt string RefreshJwt string AuthServerIss string DpopPdsNonce string DpopAuthserverNonce string DpopPrivateJwk string Expiry string}
type OAuthRequest struct { AuthserverIss string Handle string State string Did string PdsUrl string PkceVerifier string DpopAuthserverNonce string DpopPrivateJwk string ReturnUrl string}
type SessionStore struct { cache *cache.Cache}
const ( stateKey = "oauthstate:%s" requestKey = "oauthrequest:%s" sessionKey = "oauthsession:%s")
func New(cache *cache.Cache) *SessionStore { return &SessionStore{cache: cache}}
func (s *SessionStore) SaveSession(ctx context.Context, session OAuthSession) error { key := fmt.Sprintf(sessionKey, session.Did) data, err := json.Marshal(session) if err != nil { return err }
// set with ttl (7 days) ttl := 7 * 24 * time.Hour
return s.cache.Set(ctx, key, data, ttl).Err()}
// SaveRequest stores the OAuth request to be later fetched in the callback. Since// the fetching happens by comparing the state we get in the callback params, we// store an additional state->did mapping which then lets us fetch the whole OAuth request.func (s *SessionStore) SaveRequest(ctx context.Context, request OAuthRequest) error { key := fmt.Sprintf(requestKey, request.Did) data, err := json.Marshal(request) if err != nil { return err }
// oauth flow must complete within 30 minutes err = s.cache.Set(ctx, key, data, 30*time.Minute).Err() if err != nil { return fmt.Errorf("error saving request: %w", err) }
stateKey := fmt.Sprintf(stateKey, request.State) err = s.cache.Set(ctx, stateKey, request.Did, 30*time.Minute).Err() if err != nil { return fmt.Errorf("error saving state->did mapping: %w", err) }
return nil}
func (s *SessionStore) GetSession(ctx context.Context, did string) (*OAuthSession, error) { key := fmt.Sprintf(sessionKey, did) val, err := s.cache.Get(ctx, key).Result() if err != nil { return nil, err }
var session OAuthSession err = json.Unmarshal([]byte(val), &session) if err != nil { return nil, err } return &session, nil}
func (s *SessionStore) GetRequestByState(ctx context.Context, state string) (*OAuthRequest, error) { didKey, err := s.getRequestKeyFromState(ctx, state) if err != nil { return nil, err }
val, err := s.cache.Get(ctx, didKey).Result() if err != nil { return nil, err }
var request OAuthRequest err = json.Unmarshal([]byte(val), &request) if err != nil { return nil, err }
return &request, nil}
func (s *SessionStore) DeleteSession(ctx context.Context, did string) error { key := fmt.Sprintf(sessionKey, did) return s.cache.Del(ctx, key).Err()}
func (s *SessionStore) DeleteRequestByState(ctx context.Context, state string) error { didKey, err := s.getRequestKeyFromState(ctx, state) if err != nil { return err }
err = s.cache.Del(ctx, fmt.Sprintf(stateKey, state)).Err() if err != nil { return err }
return s.cache.Del(ctx, didKey).Err()}
func (s *SessionStore) RefreshSession(ctx context.Context, did, access, refresh, expiry string) error { session, err := s.GetSession(ctx, did) if err != nil { return err } session.AccessJwt = access session.RefreshJwt = refresh session.Expiry = expiry return s.SaveSession(ctx, *session)}
func (s *SessionStore) UpdateNonce(ctx context.Context, did, nonce string) error { session, err := s.GetSession(ctx, did) if err != nil { return err } session.DpopAuthserverNonce = nonce return s.SaveSession(ctx, *session)}
func (s *SessionStore) getRequestKeyFromState(ctx context.Context, state string) (string, error) { key := fmt.Sprintf(stateKey, state) did, err := s.cache.Get(ctx, key).Result() if err != nil { return "", err }
didKey := fmt.Sprintf(requestKey, did) return didKey, nil}