feat(supabase_flutter): pluggable OAuth launcher + opt-in supabase_flutter_web_auth - #1807
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughChangesThe PR adds a configurable OAuth launcher integration
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant App
participant SupabaseAuth
participant OAuthLauncher
participant AuthSession
participant AuthClient
App->>SupabaseAuth: signInWithOAuth(...)
SupabaseAuth->>OAuthLauncher: launch(authorizeUrl, redirectTo, preferEphemeral)
OAuthLauncher->>AuthSession: authenticate(authorizeUrl, options)
AuthSession-->>OAuthLauncher: callback URL
OAuthLauncher->>AuthClient: getSessionFromUrl(callback URL)
AuthClient-->>App: authenticated session
Suggested reviewers: Merge Risk: 🔵 Low · up to The repository formatting check will fail until the long documentation URL is wrapped. This is a localized, low-risk fix. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In
`@packages/supabase_flutter_web_auth/lib/src/flutter_web_auth2_oauth_launcher.dart`:
- Line 21: Reflow the documentation URL comment near the OAuth launcher
documentation so no line exceeds the repository’s 80-character Dart limit,
preserving the link and surrounding documentation; run dart format afterward.
- Around line 22-26: Update sdk-compliance.yaml to register
FlutterWebAuth2OAuthLauncher, its constructor, and launch from
packages/supabase_flutter_web_auth/lib/src/flutter_web_auth2_oauth_launcher.dart
lines 22-26; apply the same API-matrix treatment to redirectToUrl in
packages/supabase_flutter_web_auth/lib/src/oauth_redirect_stub.dart line 8 and
packages/supabase_flutter_web_auth/lib/src/oauth_redirect_web.dart line 5,
registering or intentionally excluding it consistently.
- Around line 47-54: The FlutterWebAuth2 authentication flow currently omits
useWebview, so Linux and Windows use the embedded webview rather than sharing
system-browser cookies. Update the launcher documentation and implementation
around FlutterWebAuth2.authenticate to either restrict support to Apple and
Android or explicitly document this behavior and add a verified system-browser
path for Linux and Windows.
In `@packages/supabase_flutter_web_auth/README.md`:
- Around line 5-6: Update the platform authentication description in the README
to state that Custom Tabs are Android-only, while Linux and Windows desktop use
an embedded webview. Keep the iOS/macOS ASWebAuthenticationSession description
unchanged.
In `@packages/supabase_flutter_web_auth/test/oauth_test.dart`:
- Line 5: Update the import directives in
packages/supabase_flutter_web_auth/test/oauth_test.dart lines 5-5 and
packages/supabase_flutter_web_auth/test/test_stubs.dart lines 3-3 to comply with
the repository’s 80-character Dart line-length policy using a
formatter-compatible form, or document an explicit exception if package URI
imports cannot be shortened.
In `@packages/supabase_flutter/lib/src/oauth_launcher.dart`:
- Line 41: Wrap the documentation URL comment in oauth_launcher.dart so the
affected line is no longer than 80 characters and passes the repository’s Dart
formatting check.
In `@packages/supabase_flutter/lib/supabase_flutter.dart`:
- Line 11: Update the SDK capability matrix to register the public OAuthLauncher
and UrlLauncherOAuthLauncher classes exported by oauth_launcher.dart, including
their constructors and launch methods, so check-api-symbols recognizes the
complete API.
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📒 Files selected for processing (22)
packages/supabase_flutter/lib/src/flutter_auth_client_options.dartpackages/supabase_flutter/lib/src/oauth_launcher.dartpackages/supabase_flutter/lib/src/supabase.dartpackages/supabase_flutter/lib/src/supabase_auth.dartpackages/supabase_flutter/lib/supabase_flutter.dartpackages/supabase_flutter/test/oauth_launcher_test.dartpackages/supabase_flutter_web_auth/LICENSEpackages/supabase_flutter_web_auth/README.mdpackages/supabase_flutter_web_auth/analysis_options.yamlpackages/supabase_flutter_web_auth/example/.gitignorepackages/supabase_flutter_web_auth/example/README.mdpackages/supabase_flutter_web_auth/example/analysis_options.yamlpackages/supabase_flutter_web_auth/example/lib/main.dartpackages/supabase_flutter_web_auth/example/pubspec.yamlpackages/supabase_flutter_web_auth/lib/src/flutter_web_auth2_oauth_launcher.dartpackages/supabase_flutter_web_auth/lib/src/oauth_redirect_stub.dartpackages/supabase_flutter_web_auth/lib/src/oauth_redirect_web.dartpackages/supabase_flutter_web_auth/lib/supabase_flutter_web_auth.dartpackages/supabase_flutter_web_auth/pubspec.yamlpackages/supabase_flutter_web_auth/test/oauth_test.dartpackages/supabase_flutter_web_auth/test/test_stubs.dartpubspec.yaml
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Tr00d
approved these changes
Sep 8, 2026
Vinzent03
reviewed
Sep 8, 2026
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…pabase_flutter_web_auth signInWithOAuth/signInWithSSO/linkIdentity now delegate through a new OAuthLauncher extension point (FlutterAuthClientOptions.oauthLauncher), defaulting to the existing url_launcher-based behavior with no breaking change and no new dependencies. Add supabase_flutter_web_auth, an opt-in package providing an OAuthLauncher backed by flutter_web_auth_2's system web authentication session (ASWebAuthenticationSession on Apple platforms, Custom Tabs on Android and desktop). This fixes the in-app browser never dismissing itself after a successful sign-in (#1174), and shares cookies with the system browser for SSO, without forcing every supabase_flutter user to pull in flutter_web_auth_2 and its transitive native dependencies.
- Register the new OAuthLauncher/UrlLauncherOAuthLauncher/ FlutterWebAuth2OAuthLauncher public API in sdk-compliance.yaml under the existing sign_in_with_oauth capability, and mark the internal redirectToUrl helper @internal instead, per the extractor's documented lib/src convention. Fixes the capability-matrix CI check. - Correct the launcher's docs (class comment and README): flutter_web_auth_2 only uses a system browser session (with cookie sharing) on iOS/macOS and Android; Linux/Windows fall back to an embedded webview with its own cookie store, which was previously described as sharing the same behavior. - Fix DCM findings introduced by this PR: rename FakeFlutterWebAuth2's fields so they stop shadowing its own authenticate() parameters, and use Column.spacing instead of a SizedBox spacer in the example. - Fix a pre-existing DCM finding on main (avoid-inferrable-type-arguments in AuthMFARecoveryCodesGenerateResponse.fromJson) that was otherwise failing the DCM check on this branch.
The explicit >=1.0.0 <2.0.0 range was left over from when the floor was 0.5.0 and caret syntax couldn't span pre-1.0 minors up to 2.0.0. Now that the floor is 1.0.0, ^1.0.0 is equivalent and matches the caret style used for every other dependency in these files.
…LICENSE Per review feedback: use the same "Copyright (c) 2020 Supabase" line every other package's LICENSE uses, instead of "2026 Supabase Community".
The concern was "Supabase" vs "Supabase Community", not the year.
…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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What
Makes how
signInWithOAuth/signInWithSSO/linkIdentityopen their sign-inURL pluggable, and ships the improved behavior as a new, separate, opt-in
package instead of a breaking change to
supabase_flutteritself.OAuthLauncherextension point(
FlutterAuthClientOptions.oauthLauncher), defaulting toUrlLauncherOAuthLauncher, which preserves today'surl_launcher-basedbehavior byte-for-byte (same launch modes, same Google-on-Android
external-browser workaround). No breaking change, no new dependency.
supabase_flutter_web_auth, providingFlutterWebAuth2OAuthLauncher: runs OAuth/SSO/identity-linking through asystem web authentication session (
ASWebAuthenticationSessiononiOS/macOS, Custom Tabs on Android/desktop) via
flutter_web_auth_2.Why
url_launcher's in-app browser never dismisses itself after an OAuthredirect returns to the app, leaving the user on a blank page after a
successful sign-in (#1174). A system web authentication session fixes this
and shares cookies with the system browser for SSO, but pulling
flutter_web_auth_2(and, on Linux/Windows, its own embedded-webviewdependency) into
supabase_flutterdirectly would force every app to carrythat dependency weight and would be a breaking change (drops
authScreenLaunchMode/launchMode, requires Android manifest changes).Making the launcher pluggable gets the fix to apps that want it without
touching the dependency graph or the public API of apps that don't.
Notes
supabase_flutter_web_auth's launcher drops the hardcoded"force external browser for Google on Android" workaround. Verified
against Google's OAuth policy
(https://developers.google.com/identity/protocols/oauth2/resources/best-practices):
it bans routing through an embedded user-agent under the app's control,
and Custom Tabs (the only mode
flutter_web_auth_2uses on Android) runsas Chrome's own sandboxed process, so it already satisfies the policy.
(shared
pubspec.lock):packages/supabase_flutter/example's own.flutter-plugins-dependenciesonly listsapp_links/shared_preferences/url_launcherafterpub get, whilepackages/supabase_flutter_web_auth/examplecorrectly picks upflutter_web_auth_2,desktop_webview_window,jni, etc.run
flutter create .inside it to add the ones you want to test on.Test plan
flutter testinpackages/supabase_flutter— all existingOAuth/SSO/link-identity behavior unchanged (82 pre-existing tests
pass), plus new coverage for the
OAuthLauncherextension point.flutter testinpackages/supabase_flutter_web_auth— new coveragefor
FlutterWebAuth2OAuthLauncheragainst a fakeFlutterWebAuth2Platform.flutter analyzeclean in both packages.platform folders are checked in for the new example; see Notes).
Summary by CodeRabbit
New Features
supabase_flutter_web_authpackage for system authentication sessions, shared browser cookies, and automatic session dismissal.Documentation
Tests