The Garage SDKs, in the open

garage_auth, garage_entitlements, garage_iap and garage_ui, moved out of
Garage-Services and Metro-Map-Maker into one public repo. MIT, one readme,
docs under docs/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013F4NWNvYcdeSgqbWMT1VQ7

garage_auth/lib/src/token_store.dart

@@ -0,0 +1,42 @@
+import "package:flutter_secure_storage/flutter_secure_storage.dart";
+
+// small key/value seam so the token storage backend is swappable. the default
+// is flutter_secure_storage which covers mobile + desktop properly and falls
+// back to a best-effort impl on web. anyone embedding the SDK can hand us their
+// own (e.g. an in-memory one for tests, or shared_prefs if they dont care).
+abstract class TokenStore {
+  Future<String?> read(String key);
+  Future<void> write(String key, String value);
+  Future<void> delete(String key);
+}
+
+class SecureTokenStore implements TokenStore {
+  SecureTokenStore({FlutterSecureStorage? storage})
+      : _storage = storage ?? const FlutterSecureStorage();
+
+  final FlutterSecureStorage _storage;
+
+  @override
+  Future<String?> read(String key) => _storage.read(key: key);
+
+  @override
+  Future<void> write(String key, String value) =>
+      _storage.write(key: key, value: value);
+
+  @override
+  Future<void> delete(String key) => _storage.delete(key: key);
+}
+
+// handy for tests, or platforms where you explicitly dont want persistence.
+class MemoryTokenStore implements TokenStore {
+  final Map<String, String> _m = {};
+
+  @override
+  Future<String?> read(String key) async => _m[key];
+
+  @override
+  Future<void> write(String key, String value) async => _m[key] = value;
+
+  @override
+  Future<void> delete(String key) async => _m.remove(key);
+}