token_keeper 1.1.0

Auth tokens, handled. Pure-Dart token manager with single-flight refresh, proactive expiry handling, Result-based APIs, event stream and a Dio interceptor for drop-in 401 retry.

Changelog

All notable changes to this package will be documented in this file. The format follows Keep a Changelog and this project adheres to Semantic Versioning.

1.1.0 — 2026-05-04

Major upgrade. This release replaces the package's home-grown Result<T> / Failure<T> types with the unified resilify Result / Failure model so authentication errors share the same vocabulary as the rest of your networking stack. It contains breaking changes — see "Migration" below.

Added

• resilify integration — Result<T>, Success<T>, Error<T>, and the rich Failure value type (with named constructors unauthorized, network, timeout, serverError, rateLimit, …) are re-exported from package:token_keeper/token_keeper.dart. Callers no longer need to import resilify directly; it comes along for the ride.
• RefreshRetryConfig — wraps resilify's RetryHelper.retry. Same exponential / jitter / attemptTimeout machinery used everywhere else in the resilify ecosystem. The default retryIf is failure.isRetryable, so 5xx / 408 / 429 are retried but 401 (auth dead) is not.
• Token.tryParseJwt(String, {String? refreshToken}) — pure-Dart JWT parser (base64url + JSON, no signature verification) that auto-fills expiresAt from the exp claim and scopes from scope / scp / scopes claims. Returns null on bad input; never throws.
• Token.hasScope / hasAllScopes / hasAnyScope — RFC 6749 case-sensitive scope check helpers (carried over from 1.0.x).
• CachingTokenStorage — decorator that wraps any TokenStorage backend with an in-memory cache so hot-path reads avoid disk I/O. Exposes cachedToken (sync read of the cache) and invalidate() for cross-isolate scenarios.
• TokenKeeper.tokenStream (Stream<Token?>) — reactive stream of token changes. Emits the new Token after refresh / setTokens, and null after clear() or unauthorized refresh failure.
• TokenRefreshTimer — periodic background timer that calls getValidToken() on a configurable interval. For long-lived services that don't naturally exercise the keeper through requests.
• TokenKeeper.isRefreshing — synchronous bool; true while a refresh is in flight (carried over from 1.0.1).
• TokenKeeperInterceptor.onRefreshFailed — callback receives the resilify Failure (carried over from 1.0.1).

Changed (BREAKING)

• The shape of Result<T> / Failure is now defined by resilify:
  • Failure<T> (generic) → Failure (non-generic value type with code, message, cause, stackTrace).
  • Success<T>(value) → Success<T>(data) — the field name changed.
  • Failure<T>(message: x, type: FailureType.unauthorized) → Failure.unauthorized(message: x) (or any other named constructor).
  • The FailureType enum is removed; categorise failures by HTTP code or use Failure.is4xx / is5xx / isRetryable getters.
• result.fold(onSuccess:, onFailure:) (named) → result.fold(onSuccess, onError) (positional, matches resilify).
• result.value (on Success) → result.data. result.valueOrNull → result.dataOrNull.
• Failure<Token> in RefreshFailedEvent is now plain Failure.
• TokenKeeper(retryPolicy: RefreshRetryPolicy.exponential(...)) → TokenKeeper(retryConfig: RefreshRetryConfig.exponential(...)).

Migration (1.0.x → 1.1.0)

// before
return const Failure(message: 'no token', type: FailureType.unauthorized);
// after
return const Error(Failure.unauthorized(message: 'no token'));

// before
if (firstAttempt.type == FailureType.unauthorized) { /* retry */ }
// after
if (firstAttempt.failure.code == 401) { /* retry */ }

// before
result.fold(onSuccess: (t) => ..., onFailure: (f) => ...);
// after
result.fold((t) => ..., (f) => ...);          // positional
// or
result.when(success: (t) => ..., error: (f) => ...);

// before
TokenKeeper(retryPolicy: RefreshRetryPolicy.exponential(maxAttempts: 3));
// after
TokenKeeper(retryConfig: RefreshRetryConfig.exponential(maxAttempts: 3));

dart:core.Error collision — resilify's Error<T> variant shadows dart:core.Error. If you need both in the same file, hide one: import 'dart:core' hide Error;

1.0.1 — 2026-05-02

Added

• Token.isValid([DateTime? now]) — convenience inverse of isExpired; always true for tokens with no expiresAt.
• Token.remainingLifetime([DateTime? now]) — returns Duration? until expiry; null for unknown lifetime, Duration.zero (never negative) when already expired. Useful for countdown timers and progress indicators.
• Token.hasScope(String), Token.hasAllScopes(List<String>), Token.hasAnyScope(List<String>) — RFC 6749 case-sensitive scope-check helpers; remove repetitive scopes.contains calls from application code.
• Token.fromJsonOrNull(Map<String, dynamic>) — safe deserialisation factory that returns null instead of throwing on malformed or corrupt JSON. Preferred at storage read boundaries.
• Result.getOrElse(T Function() fallback) — extracts the success value or calls fallback for a Failure; keeps call sites free of switch boilerplate for the common "or default" case.
• TokenKeeper.isRefreshing — synchronous bool getter; true while a refresh is actively in flight. Useful for showing loading spinners without subscribing to the event stream.
• TokenKeeperInterceptor.onRefreshFailed callback — optional hook invoked when a 401-triggered refresh fails. Allows navigating to login directly from the interceptor without a separate events subscription.

Improved

• Failure.toString() now produces a readable Failure(type: message[, cause: ...]) string instead of the default Equatable dump — makes test failure output immediately actionable.
• TokenEvent subclasses now implement Equatable (with props) so events can be compared with == directly in tests and reactive state layers without .runtimeType checks.

1.0.0 — 2026-05-02

Added

• Token model with JSON, equality, expiry helpers, and copyWith.
• Result<T> / Success<T> / Failure<T> sealed types with FailureType enum (unauthorized, network, unknown).
• TokenStorage interface plus InMemoryTokenStorage implementation.
• TokenKeeper core with:
  • single-flight refresh (one in-flight refresh per keeper, even under 50+ concurrent calls),
  • proactive refresh via proactiveWindow,
  • withValidToken with bounded one-shot retry on unauthorized,
  • getValidToken, forceRefresh, setTokens, clear, peek,
  • lifecycle event stream (TokenRefreshedEvent, TokenClearedEvent, RefreshFailedEvent).
• TokenKeeperInterceptor for Dio with attach + 401-refresh-and-retry.
• RefreshRetryPolicy with built-in exponential backoff factory.
• Pluggable TokenKeeperLogger and Clock / FixedClock for tests.
• 37 unit tests covering single-flight, proactive refresh, retry policy, events, interceptor 401 handling, and edge cases.