spec(auth): add concurrent PKCE flow id capability - #91
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Adds auth.sign_in.pkce_flow_id, covering supabase-js's per-flow verifier storage (bounded ring, optional flow id on exchangeCodeForSession) so other SDKs have a spec to implement against for SDK-1395.
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In `@specs/auth/pkce_flow_id.md`:
- Around line 5-8: Update the PKCE flow-ID contract in the documented auth flow
section to explicitly define how the SSO sign-in flow ID is returned to and
supplied to exchangeCodeForSession, including whether the optional redirect
mechanism applies; if SSO does not support this contract, remove SSO sign-in
from the listed PKCE flows.
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capabilities/auth.yamlspecs/auth/pkce_flow_id.md
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…view - Rename auth.sign_in.pkce_flow_id -> auth.sign_in.concurrent_pkce_flows: the id should name the end-user-facing capability (concurrent PKCE flows), not the mechanism used to implement it (a flow id). - Explicitly place SSO sign-in in the out-of-band group (it doesn't return a flow id in the reference implementation, same as OTP/resend/reset/ update-user) instead of leaving it uncategorized. - Drop the redundant Notes section: the redirect-param point duplicated the "optional correlation channel" sentence already in Behavior, and the "not a secret" aside wasn't load-bearing for an implementer. Addresses review on #91: #91 (comment) #91 (comment)
🤖 I have created a release *beep* *boop* --- ## [1.2.0](v1.1.1...v1.2.0) (2026-08-20) ### Features * **auth:** add concurrent PKCE flow id capability ([#91](#91)) ([bd6d972](bd6d972)) ### Bug Fixes * **specs:** correct third-party auth error propagation behavior ([#86](#86)) ([ccc2fbb](ccc2fbb)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). Co-authored-by: supabase-releaser[bot] <223506987+supabase-releaser[bot]@users.noreply.github.com>
Picks up the auth.sign_in.concurrent_pkce_flows capability added in supabase/sdk#91, which SDK-1395's compliance declaration depends on.
* feat(auth): support concurrent PKCE flows via flow id Store each PKCE code verifier in a per-flow slot (keyed by a generated flow id) instead of one shared slot, so starting several PKCE flows at once — two OAuth sign-ins, or an OAuth flow started while a password reset is pending — no longer lets one flow's verifier overwrite another's. Slots are bounded to 5 concurrent flows, oldest evicted first. exchangeCodeForSession(authCode:flowId:) accepts an optional flow id to select the right verifier; without one it falls back to the most recently stored verifier, matching the pre-existing single-flow behavior. OAuthResponse gains a flowId field, surfaced by getLinkIdentityURL. signInWithOAuth(launchFlow:) threads its flow id through internally so concurrent calls in the same process can't clobber each other's verifier. Both additions are additive (new optional parameter, new optional struct field with a default), so no breaking change. Fixes SDK-1395 * chore(sdk): declare auth.sign_in.concurrent_pkce_flows compliance Matches the capability added in supabase/sdk#91 (renamed from pkce_flow_id to concurrent_pkce_flows per review). * chore(ci): bump supabase/sdk reusable workflows to v1.2.0 Picks up the auth.sign_in.concurrent_pkce_flows capability added in supabase/sdk#91, which SDK-1395's compliance declaration depends on. * fix(auth): serialize CodeVerifierStorage's index read-modify-write set/remove/removeAll are called nonisolated, so concurrent flow starts can run on different threads, not just interleave at await points. The index update was an unguarded read-modify-write, so two concurrent writers could each read the index before either wrote it back, silently dropping one writer's entry and letting more than maxConcurrentFlows slots survive uncollected. Serialize the three mutating operations behind a shared lock. Reproduced with a test that fires 20 concurrent sets via DispatchQueue.concurrentPerform: 14 stale flows survived without the lock, 5 (the bound) with it. * refactor(auth): use NSRecursiveLock directly instead of LockIsolated<Void> LockIsolated exists to isolate a mutable value; here it was only ever used for its lock, wrapping Void. NSRecursiveLock (what LockIsolated uses internally) says what's actually happening without the unused-value layer.
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Summary
auth.sign_in.pkce_flow_idtocapabilities/auth.yaml: a per-flow, bounded (ring of 5) PKCE verifier storage keyed by a generated flow id, with an optional flow id selector on exchange-code-for-session.specs/auth/pkce_flow_id.mddescribing the behavior, fail-fast error contract, and scope boundary (the reference implementation's opt-in redirect-param propagation is called out as not required for baseline parity).Why
Validated against the merged
supabase-jsPR supabase/supabase-js#2569: starting two PKCE flows concurrently (two OAuth sign-ins, or an OAuth flow started while a password-recovery flow is pending) used to silently overwrite the earlier flow's verifier. This spec is a prerequisite for SDK-1395 (supabase-swift parity implementation).Test plan
npm run validatepasses locally inscripts/capability-matrix