feat(auth)!: let AuthClient own session persistence through one storage - #1805
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe change moves session persistence into ChangesUnified Auth storage
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Sequence Diagram(s)sequenceDiagram
participant SupabaseInitialize
participant AuthClient
participant SharedPreferencesAuthAsyncStorage
participant SharedPreferencesAsync
SupabaseInitialize->>AuthClient: create client with asyncStorage and storageKey
AuthClient->>SharedPreferencesAuthAsyncStorage: restore persisted session
SharedPreferencesAuthAsyncStorage->>SharedPreferencesAsync: read session key
SharedPreferencesAsync-->>SharedPreferencesAuthAsyncStorage: return stored value
SharedPreferencesAuthAsyncStorage-->>AuthClient: return session data
AuthClient-->>SupabaseInitialize: complete initialized
Merge Risk: 🟡 Moderate · up to This refactor centralizes session persistence and migration, but release builds may silently fail to persist sessions even when applications explicitly request it, causing users to be signed out after restart. That behavior should be resolved before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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Inline comments:
In `@packages/supabase_auth/lib/src/auth_client.dart`:
- Line 1821: Update recoverSession around the persisted-session read to capture
_sessionVersion before awaiting storage, then restore via setInitialSession only
if the version is unchanged; otherwise skip the stale restoration and any
corresponding old-session write while preserving normal recovery behavior.
In `@packages/supabase_auth/lib/src/pkce_verifier_store.dart`:
- Around line 138-141: Update the no-flow-id fallback used by the verifier store
and its _remove path to also consult _legacyPrefixIndexKey, then remove the
matching legacy-prefix slot alongside _legacyPrefixKey. Add a regression test
covering remove() without a flow ID and verifying the legacy slot is deleted.
In
`@packages/supabase_flutter/lib/src/shared_preferences_auth_async_storage.dart`:
- Line 143: Update removeItem and _retireLegacyItem so the migration marker is
written before accessing the legacy store, ensuring it remains set if
SharedPreferences initialization or containsKey fails; then perform legacy
cleanup as best effort without preventing marker persistence.
In `@packages/supabase_flutter/test/storage_migration_test.dart`:
- Line 12: Update the shared_preferences_platform_interface import near the top
of the test file to comply with the 80-character Dart line limit, using an
approved local lint exception or an existing shorter project-local export
without changing dependency behavior.
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MIGRATION.mdpackages/supabase/lib/src/supabase_client.dartpackages/supabase/lib/src/supabase_client_options.dartpackages/supabase/test/client_test.dartpackages/supabase/test/postgrest_options_test.dartpackages/supabase/test/stream_filter_test.dartpackages/supabase/test/stream_integration_test.dartpackages/supabase/test/trace_propagation_test.dartpackages/supabase_auth/lib/src/auth_client.dartpackages/supabase_auth/lib/src/auth_constants.dartpackages/supabase_auth/lib/src/pkce_verifier_store.dartpackages/supabase_auth/lib/src/types/auth_async_storage.dartpackages/supabase_auth/lib/supabase_auth.dartpackages/supabase_auth/test/memory_async_storage_test.dartpackages/supabase_auth/test/otp_mock_test.dartpackages/supabase_auth/test/pkce_flow_test.dartpackages/supabase_auth/test/session_persistence_test.dartpackages/supabase_auth/test/src/constants_test.dartpackages/supabase_common/lib/src/persist_session_key.dartpackages/supabase_flutter/README.mdpackages/supabase_flutter/lib/src/flutter_auth_client_options.dartpackages/supabase_flutter/lib/src/local_storage.dartpackages/supabase_flutter/lib/src/local_storage_stub.dartpackages/supabase_flutter/lib/src/local_storage_web.dartpackages/supabase_flutter/lib/src/shared_preferences_auth_async_storage.dartpackages/supabase_flutter/lib/src/shared_preferences_storage_stub.dartpackages/supabase_flutter/lib/src/shared_preferences_storage_web.dartpackages/supabase_flutter/lib/src/supabase.dartpackages/supabase_flutter/lib/src/supabase_auth.dartpackages/supabase_flutter/lib/supabase_flutter.dartpackages/supabase_flutter/pubspec.yamlpackages/supabase_flutter/test/auth_test.dartpackages/supabase_flutter/test/deep_link_test.dartpackages/supabase_flutter/test/initialization_test.dartpackages/supabase_flutter/test/lifecycle_after_dispose_test.dartpackages/supabase_flutter/test/lifecycle_test.dartpackages/supabase_flutter/test/local_storage_migration_test.dartpackages/supabase_flutter/test/logging_test.dartpackages/supabase_flutter/test/persist_session_broadcast_test.dartpackages/supabase_flutter/test/storage_migration_test.dartpackages/supabase_flutter/test/storage_test.dartpackages/supabase_flutter/test/storage_web_test.dartpackages/supabase_flutter/test/supabase_flutter_test.dartpackages/supabase_flutter/test/utils.dartpackages/supabase_flutter/test/widget_test.dartpackages/supabase_flutter/test/widget_test_stubs.dartpackages/supabase_testing/README.mdpackages/supabase_testing/lib/src/test_supabase_client.dartsdk-compliance.yaml
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- packages/supabase_flutter/test/local_storage_migration_test.dart
- packages/supabase_flutter/lib/src/local_storage_stub.dart
- packages/supabase_flutter/lib/src/local_storage.dart
- packages/supabase_flutter/pubspec.yaml
- packages/supabase_flutter/lib/src/local_storage_web.dart
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Inline comments:
In `@MIGRATION.md`:
- Line 1000: Update the pre-v3 “Before” example’s AuthClientOptions
configuration to use pkceAsyncStorage instead of asyncStorage, preserving the
example as executable code rather than labeling it pseudocode.
In `@packages/supabase_auth/lib/src/auth_client.dart`:
- Line 1834: Update setInitialSession so restore cleanup only calls
_removeSession and removes persisted state when _sessionVersion still matches
versionBeforeRead; preserve any newer session established while awaiting
cleanup, and keep the existing invalid-data error behavior.
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MIGRATION.mdpackages/supabase/lib/src/supabase_client.dartpackages/supabase_auth/lib/src/auth_client.dartpackages/supabase_flutter/lib/src/flutter_auth_client_options.dartpackages/supabase_flutter/test/persist_session_broadcast_test.dart
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Inline comments:
In `@packages/supabase_auth/lib/src/auth_client.dart`:
- Around line 98-101: Update the auth client constructor validation around the
existing persistSession and asyncStorage check to throw ArgumentError when
persistSession is true and asyncStorage is null, ensuring this validation runs
in release builds rather than relying only on assert. Preserve the current
valid-configuration behavior and error message context.
In
`@packages/supabase_flutter/lib/src/shared_preferences_auth_async_storage.dart`:
- Line 60: Update removeItem so it awaits _retireLegacyItem(key) immediately
after web.removeItem(key) and before returning, preventing _migrateLegacyWebItem
from restoring stale values.
- Around line 108-109: Update SharedPreferencesAuthAsyncStorage migration
methods to serialize each key’s complete legacy getItem, setItem, and removeItem
sequence through the storage boundary, preventing concurrent setItem/removeItem
calls from overtaking migration. Preserve the no-marker path for keys absent
from the legacy store.
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MIGRATION.mdpackages/supabase_auth/lib/src/auth_client.dartpackages/supabase_auth/lib/src/pkce_verifier_store.dartpackages/supabase_auth/test/session_persistence_test.dartpackages/supabase_flutter/lib/src/shared_preferences_auth_async_storage.dartpackages/supabase_flutter/lib/src/supabase_auth.dartpackages/supabase_flutter/test/deep_link_test.dartpackages/supabase_flutter/test/persist_session_broadcast_test.dartpackages/supabase_flutter/test/storage_web_test.dart
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- MIGRATION.md
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Vinzent03
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First of all I'm very happy this can finally land. Didn't expect it to take 2 years with even being designed non breaking in the beginning.
I'm a bit unsure about creating an initial session event when persist session is off. It has no real value. The only benefit of it I see is for a flutter application to quickly turning off the persistence without having to change their logic regarding an initial session.
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I changed it in 49714d4 so that the event now means "startup is done, here is the current state" rather than "a session was restored", so it's now always emitted instead. That matches auth-js, where INITIAL_SESSION always fires, and it also leads to that we can remove the @internal call in supabase_flutter. |
They really should support threads for comments directly on the PRs too. 😅 I re-did it so that the event is sent per subscriber instead, which is what auth-js and supabase-swift do. So each listener will get Great review, as always! |
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I was not aware of the replay subject meaning sign in events would replay. Great that is fixed. This still means that the |
Yeah, I think it's worth it having this aligned. :)
It is not needed in the public surface for the common Flutter users, but the initialization still uses it under the hood. |
Move session persistence from supabase_flutter into `AuthClient`. The client takes one `AuthAsyncStorage` for the session and the pkce code verifiers, writes the session whenever it changes when `persistSession` is set, and restores it when it is created. `initialized` completes once the restore is done and `Supabase.initialize` awaits it, so the session is available when it returns as before. An expired session is refreshed after that, so the wait never touches the network. `storageKey` names the key the session lives under, defaulting to the one the other Supabase libraries derive from the project URL. It also prefixes the pkce verifier keys and names the broadcast channel, so clients for different projects can share a storage. Verifiers under the old `supabase.auth.token` prefix are still read and cleaned up. `LocalStorage`, `EmptyLocalStorage`, `SharedPreferencesLocalStorage` and `FlutterAuthClientOptions.localStorage` are removed, `pkceAsyncStorage` is renamed to `asyncStorage`, and the `AuthAsyncStorage` methods take positional parameters. `SharedPreferencesAuthAsyncStorage` remains the Flutter default, using `window.localStorage` on web and moving values written by v2 through the legacy `SharedPreferences` API over on first read. The no-op `CancelableOperation` around the old recovery is gone with it. Closes SDK-1750
Skip the restore when the session changed while the storage was being read, so a sign-in that raced it is not replaced by the stored session. Clear the legacy prefix slot when a verifier found through it is spent without a flow id. Write the migration marker when the legacy store cannot be read at removal, so a stale v2 session cannot come back afterwards.
Route `updateUser` through `_saveSession` so the updated user reaches the storage. Split the restore into the part `initialized` waits for and the refresh, emit the initial session in every branch, and only refresh a restored session that has expired instead of writing an unexpired one back. Walk the current and the legacy pkce prefix through one code path. On web, move a verifier written by v2 through the legacy shared preferences API over to `window.localStorage`, and remember in-process which keys have been checked so the legacy store is probed once per key.
…rites Run the storage operations one after the other, so a read that is still moving a legacy value over cannot put it over a value written or removed in the meantime. On web, removing a value also deletes what the legacy shared preferences API holds for the key, so a signed-out session is not brought back by a later read.
`AuthClient` emits `initialSession` once it is created whether or not the session is persisted, carrying the restored session or null, as auth-js does. `Supabase.initialize` no longer emits it on the client's behalf for a non-persisting client, so the event has one meaning for every client: the startup state is known.
Every new subscriber of `onAuthStateChange` first receives `initialSession` with the session at that moment, as auth-js and supabase-swift do, once the persisted session has been restored. Events that fire while a subscriber waits for the restore are held back so the initial event stays first. The stream no longer replays its latest event or error to late subscribers, so a listener attached after a sign-in gets `initialSession` with that session rather than a replayed `signedIn`.
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…ackage Rebasing onto main pulled in two unrelated refactors that broke compilation: LocalStorage/EmptyLocalStorage/pkceAsyncStorage were removed in favor of a single FlutterAuthClientOptions.asyncStorage (#1805), and supabase_testing was renamed to supabase_test with its HTTP mocking rebuilt around MockSupabaseHttpClient/stubHandler. Updates both test suites to the new APIs: asyncStorage instead of localStorage/pkceAsyncStorage, and MockSupabaseHttpClient in place of the hand-rolled PkceHttpClient.
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Note
Stacked on #1804, which adds
persistSessiontoAuthClient. The base flips tomainonce that merges.What kind of change does this PR introduce?
Breaking refactor of session persistence, tracked in SDK-1750.
Credit to @Vinzent03: the design here is the one from #1087, opened in November 2024. A single storage interface for the session and the pkce verifiers, the client owning persistence like auth-js,
persistSessionandstorageKeyon the auth options, and dropping the no-opCancelableOperationaround the recovery all come from that PR. It could not be rebased after the package rename and the v3 cleanups, so this is a fresh implementation of the same idea.What is the current behavior?
Session persistence lives in
supabase_flutter:SupabaseAuthlistens toonAuthStateChangeand writes the session to aLocalStorage, while the pkce code verifiers go to a separateAuthAsyncStoragepassed aspkceAsyncStorage. Customizing storage means implementing two interfaces, and the plainsupabasepackage has no session persistence at all.What is the new behavior?
AuthClientowns persistence, as in auth-js:AuthAsyncStorage(AuthClientOptions.asyncStorage, renamed frompkceAsyncStorage) holds the session and the code verifiers. Its methods take positional parameters.persistSessionthe client writes the session on every change and restores it on construction. Writes are queued in order and a failed write is logged rather than thrown.AuthClient.initializedcompletes once the restore is done;Supabase.initializeawaits it, socurrentSessionis set when it returns, as before. An expired session is refreshed afterinitializedcompletes, so the wait never touches the network.storageKeynames the session key, defaulting todefaultPersistSessionKey(url). It also prefixes the pkce verifier keys and names the broadcast channel.PKCEVerifierStorestill reads and cleans up verifiers under the oldsupabase.auth.tokenprefix so an in-flight flow completes across the upgrade.LocalStorage,EmptyLocalStorage,SharedPreferencesLocalStorageandFlutterAuthClientOptions.localStorageare gone.persistSession: falsereplacesEmptyLocalStorage.SharedPreferencesAuthAsyncStoragestays the Flutter default. On web it writes towindow.localStorageso the session is shared with supabase-js, and it decodes a verifier thatSharedPreferencesAsyncJSON-encoded there before. On other platforms a value written by v2 through the legacySharedPreferencesAPI is moved over on first read, once per key, and a removed value retires its legacy entry so a signed-out session cannot come back.SupabaseAuthinsupabase_flutterloses the storage handling, and the no-opCancelableOperationaround the old recovery goes with it.package:asyncis no longer a dependency ofsupabase_flutter.initialSessionis emitted to every new subscriber ofonAuthStateChangeas its first event, with the session at that moment, the way auth-js and supabase-swift do. It waits for the restore, and events that fire in the meantime are held back so the initial one stays first. The stream no longer replays its latest event or error to late subscribers; a listener attached after a sign-in getsinitialSessionwith that session instead of a replayedsignedIn.AuthClient.initializedremains the await point for the restore, since the event now describes the moment of subscription rather than startup.The ticket asked for the storage write to be awaited before notifying subscribers. The write is queued instead, so
_saveSessionstays synchronous and the session version checks around refreshes keep their meaning. The write still happens at the same time, only the event no longer waits for it.Breaking changes
See the two new sections in
MIGRATION.md. In short:LocalStorageand its implementations are removed,pkceAsyncStorageisasyncStorage,AuthAsyncStoragemethods are positional, and the pkce verifier keys move understorageKey.Tests
packages/supabase_auth/test/session_persistence_test.dart: write on sign-in, removal on sign-out, restore in a new client, custom key, non-persisting client, expired session refresh and sign-out, corrupt values, failing storage.packages/supabase_auth/test/pkce_flow_test.dart: legacy prefix fallback and cleanup.packages/supabase_flutter/test/storage_migration_test.dart,storage_test.dart,storage_web_test.dart(browser): the unified storage on VM and web, including the v2 migrations.supabase_fluttertests are ported toasyncStorage. The fullsupabase_auth,supabaseandsupabase_fluttersuites pass locally, the browser ones on Chrome.Compliance matrix
client.session_management.custom_storageandpersist_sessionare reconciled. Symbol and drift checks pass locally.Closes SDK-1750
Summary by CodeRabbit
New Features
Breaking Changes
localStorageandpkceAsyncStoragewithasyncStorage.Documentation