fix(auth)!: only open the broadcast channel when the session is persisted - #1804
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…sted Add `persistSession` to `AuthClient` and `AuthClientOptions`, defaulting to false, and move `FlutterAuthClientOptions.persistSession` onto the parent so the flag that already selected the Flutter session storage now also reaches the auth client. On web the client opened its `BroadcastChannel` unconditionally, so every client for the same project on a page shared one channel. A sign-in through the app's client was written into a standalone client created with the service role key, which then made its requests with the user's JWT. The channel is now only opened, and its messages only sent, when the session is persisted, matching auth-js. Fixes #1085
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe change adds ChangesSession persistence configuration and broadcasting
Priority: ➖ Normal — Impact reflects medium issue severity. Estimated code review effort: 2 (Simple) | ~15 minutes Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to Web authentication synchronization is limited to clients that persist sessions, preventing in-memory clients from receiving shared session events. Current merge-readiness risk is minimal. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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This was referenced Sep 8, 2026
Derive `persistSession` in `Supabase.initialize` from the resolved storage, so an `EmptyLocalStorage` never opens the channel and a custom storage always does. Never open it for a client that authenticates with a third-party `accessToken`, since that client has no session of its own. Pass the auth options object to the auth client instead of forwarding six fields, forward `retryOptions` from the Flutter options, and fold the gate into the web-only condition. Rewrite the regression tests on `signInTestUser`, await the broadcast in the positive cases, move the supabase_auth browser tests to `test/browser` and run them on Chrome in CI, and fix the migration guide snippets so they pass the pkce storage the constructor asserts on.
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In `@packages/supabase_auth/test/browser/persist_session_broadcast_test.dart`:
- Line 27: Update collectBroadcasts and both isolation tests so the sign-in
action is passed into collectBroadcasts, awaited after the broadcast
subscription is established, and only then followed by the 500 ms observation
delay. Ensure the timeout cannot begin before signInTestUser(sender) completes.
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.github/workflows/test.ymlMIGRATION.mdpackages/supabase/lib/src/supabase_client.dartpackages/supabase/lib/src/supabase_client_options.dartpackages/supabase_auth/lib/src/auth_client.dartpackages/supabase_auth/test/browser/broadcast_web_test.dartpackages/supabase_auth/test/browser/persist_session_broadcast_test.dartpackages/supabase_flutter/lib/src/flutter_auth_client_options.dartpackages/supabase_flutter/lib/src/supabase.dartpackages/supabase_flutter/test/persist_session_broadcast_test.dart
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…ge (#1805) > [!NOTE] > Stacked on #1804, which adds `persistSession` to `AuthClient`. The base flips to `main` once 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, `persistSession` and `storageKey` on the auth options, and dropping the no-op `CancelableOperation` around 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`: `SupabaseAuth` listens to `onAuthStateChange` and writes the session to a `LocalStorage`, while the pkce code verifiers go to a separate `AuthAsyncStorage` passed as `pkceAsyncStorage`. Customizing storage means implementing two interfaces, and the plain `supabase` package has no session persistence at all. ## What is the new behavior? `AuthClient` owns persistence, as in auth-js: - One `AuthAsyncStorage` (`AuthClientOptions.asyncStorage`, renamed from `pkceAsyncStorage`) holds the session and the code verifiers. Its methods take positional parameters. - With `persistSession` the 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.initialized` completes once the restore is done; `Supabase.initialize` awaits it, so `currentSession` is set when it returns, as before. An expired session is refreshed after `initialized` completes, so the wait never touches the network. - `storageKey` names the session key, defaulting to `defaultPersistSessionKey(url)`. It also prefixes the pkce verifier keys and names the broadcast channel. `PKCEVerifierStore` still reads and cleans up verifiers under the old `supabase.auth.token` prefix so an in-flight flow completes across the upgrade. - `LocalStorage`, `EmptyLocalStorage`, `SharedPreferencesLocalStorage` and `FlutterAuthClientOptions.localStorage` are gone. `persistSession: false` replaces `EmptyLocalStorage`. - `SharedPreferencesAuthAsyncStorage` stays the Flutter default. On web it writes to `window.localStorage` so the session is shared with supabase-js, and it decodes a verifier that `SharedPreferencesAsync` JSON-encoded there before. On other platforms a value written by v2 through the legacy `SharedPreferences` API 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. - `SupabaseAuth` in `supabase_flutter` loses the storage handling, and the no-op `CancelableOperation` around the old recovery goes with it. `package:async` is no longer a dependency of `supabase_flutter`. - `initialSession` is emitted to every new subscriber of `onAuthStateChange` as 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 gets `initialSession` with that session instead of a replayed `signedIn`. `AuthClient.initialized` remains 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 `_saveSession` stays 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: `LocalStorage` and its implementations are removed, `pkceAsyncStorage` is `asyncStorage`, `AuthAsyncStorage` methods are positional, and the pkce verifier keys move under `storageKey`. ## 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. - The remaining `supabase_flutter` tests are ported to `asyncStorage`. The full `supabase_auth`, `supabase` and `supabase_flutter` suites pass locally, the browser ones on Chrome. ## Compliance matrix `client.session_management.custom_storage` and `persist_session` are reconciled. Symbol and drift checks pass locally. Closes SDK-1750 <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit - **New Features** - Sessions and PKCE verifiers now use shared, configurable asynchronous storage. - Added customizable storage keys and an initialization signal for session restoration. - Flutter uses asynchronous shared-preferences storage by default, with legacy-value migration. - Expired restored sessions can refresh automatically, and PKCE flows continue to support legacy stored values. - **Breaking Changes** - Replaced `localStorage` and `pkceAsyncStorage` with `asyncStorage`. - Updated custom storage methods to use positional parameters. - Removed legacy local-storage APIs and related configuration options. - **Documentation** - Added migration guidance and updated custom storage examples. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Credit to @Vinzent03: gating the broadcast channel on
persistSessionwas part of #1087, which also diagnosed #1085 as a consequence of the unconditional channel back in 2024. This PR carries that part over to the v3 code base.What kind of change does this PR introduce?
Bug fix with a breaking default for standalone clients on web.
What is the current behavior?
AuthClientopens the multi-tabBroadcastChannelunconditionally on web, keyed only by the project URL. Every client for the same project on a page therefore shares one channel. When the app's client signs a user in, the broadcast handler in a standaloneSupabaseClientcreated with the service role key saves that session too, and the service client starts sending the user's JWT. This is #1085.persistSessiononly exists onFlutterAuthClientOptions, where it selects between shared preferences and the in-memoryEmptyLocalStorage.What is the new behavior?
AuthClientandAuthClientOptionsgainpersistSession, defaulting tofalse.FlutterAuthClientOptions.persistSessionnow lives on the parent (still defaulting totrue), so the same flag selects the Flutter session storage and reaches the auth client._mayStartBroadcastChannelreturns early when the session is not persisted. A client that does not persist neither sends nor receives cross-tab auth events, matching auth-js which only creates the channel whenpersistSessionis set.Breaking changes
A
SupabaseClientorAuthClientconstructed directly no longer takes part in cross-tab session sync on web unlesspersistSession: trueis passed.Supabase.initializekeeps syncing by default.Tests
packages/supabase_auth/test/src/persist_session_broadcast_test.dart(browser only): persisting clients receive each other's events, a non-persisting client is neither written to nor broadcasts.packages/supabase_flutter/test/persist_session_broadcast_test.dart(browser only, runs in theflutter test --platform chromejob): a sign-in throughSupabase.instance.clientdoes not reach a standalone service role client, and does reach a second client withpersistSession: true.Compliance matrix
client.session_management.persist_sessionnow listsAuthClientOptions.persistSessioninstead of the removedFlutterAuthClientOptions.persistSessionfield. Symbol and drift checks pass locally.Fixes #1085
Closes SDK-1749
Summary by CodeRabbit
New Features
Bug Fixes
Documentation