ValidationError -> UnprocessableEntity(exc.json()) so CLI consumers
can parse the error body. The previous str(errors()) produced a
Python repr (single-quoted dicts), not JSON. Also align with
sibling openapi controllers: request.args.to_dict(flat=True)
and 'as exc' naming.
Test cleanup: hoist module-scope imports; add a happy-path
positive case covering every field.
Replaces ad-hoc int(request.args.get(...)) parsing in AppListApi.get
with a typed Pydantic query model. Bad inputs (page=abc, limit=-1,
limit=500, mode=invalid, missing workspace_id) raise ValidationError
which the handler converts to 422 with field-level error detail
instead of 500 / silent empty page. Closes the mode whitelist via
AppMode enum.
Verified via direct unit tests on AppListQuery (no HTTP integration
tests required since the model carries the validation contract).
- Correct docstring: Flask-RESTX iterates method_decorators forward;
the last entry becomes outermost via composition, not via framework
reversal.
- Extract shared _APPS_READ_DECORATORS constant; was duplicated
verbatim between AppReadResource and AppListApi.
- Rename _AppReadResource -> AppReadResource (no longer module-private
since app_info.py imports it). Drops the pyright ignore.
Four per-app GETs (/apps/<id>, /info, /parameters, /describe) repeated
the same SSO-guard / app-load / membership-check pattern. Hoist into
_AppReadResource with method_decorators=[require_scope, validate_bearer]
plus _load(app_id) -> (App, AuthContext). Subclasses now 3-line bodies.
Eliminates the per-method # type: ignore[reportUntypedFunctionDecorator]
suppression by relocating the decorator chain to the class attribute.
Endpoints now build typed AppInfoResponse / AppDescribeResponse and
.model_dump() at the boundary.
The previous test asserted only that model_fields exposed the
expected names — the legacy Generic[T] form would have passed
identically. Switch to __type_params__, which is non-empty only
under PEP 695 native syntax.
- Shared conftest at tests/integration_tests/controllers/openapi/:
workspace_account, app_in_workspace, mint_token (factory + tracked
cleanup of OAuthAccessToken rows), account_token convenience fixture,
autouse disable_enterprise (default ENTERPRISE_ENABLED=False; tests
needing the EE branch override in-test), autouse _flush_auth_redis.
- test_auth.py covers Layer 0 + per-token rate limit + scope on /info.
other_workspace_app fixture is a generator that cleans up the second
tenant + app on teardown.
- test_apps.py covers the read surface: /apps list with pagination
envelope, /apps/<id>, /info, /parameters, /describe, /account/sessions
envelope migration, plus dfoe_ scope rejection on apps:read routes.
Read-side surface for difyctl describe / get / list:
- GET /openapi/v1/apps paginated list (workspace_id required)
- GET /openapi/v1/apps/<id> single app summary
- GET /openapi/v1/apps/<id>/parameters port of service_api parameters
- GET /openapi/v1/apps/<id>/describe merged { info, parameters }
All gated by validate_bearer(ACCEPT_USER_ANY) + require_scope(APPS_READ) +
require_workspace_member(ctx, tenant_id). SSO subjects 404 (account-only
helper account_or_404 deduplicates the guard across the four endpoints).
PaginationEnvelope[T] (page, limit, total, has_more, data) is the canonical
shape for every /openapi/v1/* list endpoint. has_more is computed by the
server from page * limit < total. /account/sessions migrates from the
legacy { sessions: [...] } shape to the envelope; integration tests assert
the legacy key is gone.
Bearer auth surface for /openapi/v1/* run-routes:
- OAUTH_BEARER_PIPELINE (renamed from APP_PIPELINE for clarity outside this
module) composes BearerCheck → ScopeCheck → AppResolver →
WorkspaceMembershipCheck → AppAuthzCheck → CallerMount.
- BearerAuthenticator.authenticate() is the single source of identity +
rate-limit. Both pipeline (BearerCheck) and decorator (validate_bearer)
delegate to it, so per-token rate limit fires exactly once per request.
- Layer 0 (workspace membership) is CE-only; on EE the gateway owns
tenant isolation. Verdicts are cached on the AuthContext entry as
verified_tenants: dict[str, bool] (legacy "ok"/"denied" strings tolerated
by from_cache for one TTL cycle, then removed).
- check_workspace_membership(...) is the shared core; the pipeline step
and the inline require_workspace_member helper both delegate to it.
- Per-token rate limit: 60/min sliding window, RFC-7231-compliant 429
with Retry-After header + JSON body { error, retry_after_ms }. Bucket
key is sha256(token) so all replicas share state via Redis.
API hygiene:
- Scope StrEnum (FULL, APPS_READ, APPS_RUN) replaces bare string literals.
- /openapi/v1/apps/<id>/info: scope flipped from apps:run to apps:read.
- /info migrates off the pipeline to validate_bearer + require_scope +
require_workspace_member (no AppAuthzCheck/CallerMount needed for reads).
- ResolvedRow gains to_cache() / from_cache() classmethods.
- AuthContext gains token_hash + verified_tenants, dropping the per-route
re-hash and per-request Redis read on the cache hit path.
OPENAPI_RATE_LIMIT_PER_TOKEN config (default 60).
Type and lint pass over the openapi controllers, auth pipeline, and
oauth bearer/device-flow plumbing. Down from 36 pyright errors and 16
ruff errors to 0/0; 93 openapi unit tests pass.
Logic fixes:
- libs/oauth_bearer.py: drop private-naming on the friend-API methods
consumed by _VariantResolver (cache_get / cache_set_positive /
cache_set_negative / hard_expire / session_factory). They were always
cross-class accessors — leading underscore was misleading. Add public
registry property on BearerAuthenticator. _hard_expire row_id widened
to UUID | str (matches the StringUUID column type).
- libs/oauth_bearer.py: type validate_bearer / bearer_feature_required
with ParamSpec / PEP-695 so wrapped routes preserve their signature.
- libs/rate_limit.py: same — typed rate_limit decorator.
- services/oauth_device_flow.py: mint_oauth_token / _upsert accept
Session | scoped_session (Flask-SQLAlchemy proxy). Guard row-is-None
after upsert.
- controllers/openapi/{chat,completion,workflow}_messages.py: tuple-vs-
Mapping shape narrowing on AppGenerateService.generate return —
production returns Mapping, tests mock as (body, status). Validate
through Pydantic Response model in both shapes.
- controllers/openapi/oauth_device.py: replace flask_restx.reqparse (banned)
with Pydantic Request/Query models — DeviceCodeRequest, DevicePollRequest,
DeviceLookupQuery, DeviceMutateRequest. Two PEP-695 generic helpers
(_validate_json / _validate_query) translate ValidationError to BadRequest.
- controllers/openapi/auth/strategies.py: Protocol param-name match
(subject_type), Optional narrowing on app/tenant/account_id/subject_email.
- controllers/openapi/auth/steps.py: subject_type-is-None guard before
mounter dispatch.
- core/app/apps/workflow/generate_task_pipeline.py + models/workflow.py:
add WorkflowAppLogCreatedFrom.OPENAPI + matching match-case branch.
Fixes match-exhaustiveness and possibly-unbound created_from.
- libs/device_flow_security.py: pyright ignore on flask after_request
hook (registered by the framework, pyright sees as unused).
- services/oauth_device_flow.py: rename Exceptions to *Error suffix
(StateNotFoundError / InvalidTransitionError / UserCodeExhaustedError);
same for libs/oauth_bearer.py (InvalidBearerError / TokenExpiredError).
Update all callers across openapi controllers.
- controllers/openapi/{oauth_device,oauth_device_sso}.py +
services/oauth_device_flow.py: switch logger.error in except blocks
to logger.exception (TRY400) — keeps the traceback for ops.
- configs/feature/__init__.py: OPENAPI_KNOWN_CLIENT_IDS computed_field
needs an @property alongside for pyright to see it as a value, not a
method. Matches the existing line-451 pattern.
Plus ruff format + import-sort across the openapi tree (pure formatting).
When an unauthenticated user submits a user_code, the chooser view
holds the typed code and redirects to /signin. After login, the page
re-mounts on /device with no URL params (already scrubbed on the
first render) and account loaded — but the existing useEffect path
only advanced when ssoVerified or urlUserCode was present.
Add an early branch: if view is chooser and account just loaded,
advance to authorize_account using the userCode stashed in view
state. Also widen the effect deps to view (not view.kind) so the
nested userCode reads stay current.
Adds the openapi blueprint branch in load_user_from_request so that
account-branch device-flow approval routes (approve / deny /
approval-context) can authenticate via the console session cookie
under @login_required.
Splits extract_access_token into two helpers:
- extract_console_cookie_token (cookie-only) — used by openapi
approval routes that must not fall through to the Authorization
header, where dfoa_/dfoe_ bearers live (those aren't JWTs and
PassportService.verify would crash on them).
- extract_access_token retains both code paths for legacy callers.
Ports service_api/app/{completion,workflow}.py to bearer-authed
/openapi/v1/apps/<app_id>/{info,chat-messages,completion-messages,workflows/run}.
Architecture:
- New controllers/openapi/auth/ package: Pipeline + Step protocol over
one mutable Context. Endpoints attach via @APP_PIPELINE.guard(scope=...)
— single attachment point; forgetting auth is structurally impossible.
- Pipeline order: BearerCheck -> ScopeCheck -> AppResolver -> AppAuthzCheck
-> CallerMount.
- Strategies vary along independent axes: AclStrategy (EE webapp-auth inner
API) vs MembershipStrategy (CE TenantAccountJoin); AccountMounter vs
EndUserMounter dispatched by SubjectType.
- App is in URL path (not header). Each non-GET has typed Pydantic Request;
each non-SSE response has typed Pydantic Response. Bearer-as-identity:
body 'user' field stripped, ignored if present.
Adds InvokeFrom.OPENAPI enum variant. Emits app.run.openapi audit log
on successful invocation via standard logger extra={"audit": True, ...}
convention.
Phase F retired the legacy /v1/oauth/device/* mounts but the cookie path
still pointed at the dead prefix. Browsers therefore dropped the cookie
on the canonical /openapi/v1/oauth/device/* requests, so SSO-branch
approval-context and approve-external returned 401 no_session even
right after sso-complete had set the cookie.
Phase F removed legacy /v1/oauth/device/* and /console/api/oauth/device/*
mounts in favour of /openapi/v1. Without this rule /openapi falls through
to location / and proxies to web:3000, returning 404 for every API call.
Web and CLI consumers now hit /openapi/v1/* directly, so the dual-mount
shims can go:
- controllers/oauth_device_sso.py (legacy /v1/oauth/device/sso-* + /v1/device/sso-complete)
- controllers/service_api/oauth.py (legacy /v1/oauth/device/*, /v1/me, /v1/oauth/authorizations/self)
- controllers/console/auth/oauth_device.py (placeholder for legacy /console/api/oauth/device/{approve,deny})
- the deferred _register_legacy_console_mount() inside openapi/oauth_device.py
Imports in controllers/console/__init__.py, controllers/service_api/__init__.py,
and extensions/ext_blueprints.py pruned. Tests rewritten to openapi-only.
Approve/deny + lookup + SSO endpoints now live under /openapi/v1/oauth/device/*.
Approve/deny use direct fetch with console session cookie + CSRF instead of
the /console/api-prefixed post() helper.
GET /openapi/v1/workspaces lists tenants the bearer's account is a
member of. GET /openapi/v1/workspaces/<id> returns one workspace
detail, member-gated (404 on non-member, never 403, so workspace IDs
don't leak across tenants).
Bearer-authed via @validate_bearer(accept=ACCEPT_USER_ANY). External
SSO bearers (no account_id) get an empty list / 404 — same posture as
GET /openapi/v1/account.
Cookie-authed /console/api/workspaces stays in console for the
dashboard SPA — different consumer, different auth model. No legacy
/v1/ remount this phase.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
Match the existing api-group convention: one module per resource family
with multiple Resource classes per file (cf service_api/dataset/dataset.py
with 7 routes, console/auth/oauth_device.py with 2 before this branch).
The Phase B-D fragmentation (one file per route under
controllers/openapi/oauth_device/) was inconsistent with the codebase.
Collapse into:
controllers/openapi/oauth_device.py (5 routes: code, token,
lookup, approve, deny —
account branch)
controllers/openapi/oauth_device_sso.py (4 routes: sso-initiate,
sso-complete,
approval-context,
approve-external —
EE-only SSO branch)
The split mirrors the original pre-migration layout: account branch in
console/auth/oauth_device.py, SSO branch in controllers/oauth_device_sso.py
(root). Both legacy mount files updated to import from the new modules.
No behavior change; 59 tests still green. Test files updated to import
from the consolidated module paths.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
The four EE-only SSO handlers (sso_initiate, sso_complete,
approval_context, approve_external) move from controllers/oauth_device_sso.py
to controllers/openapi/oauth_device/. Each is registered on openapi_bp
via @bp.route at the canonical path:
/openapi/v1/oauth/device/sso-initiate
/openapi/v1/oauth/device/sso-complete
/openapi/v1/oauth/device/approval-context
/openapi/v1/oauth/device/approve-external
sso-complete moves under /oauth/device/ from its previous orphan path
/v1/device/sso-complete; the IdP-side ACS callback URL hardcoded in
sso_initiate now points to the canonical path. Operators must
re-register the ACS callback with each IdP before Phase F deletes the
legacy alias.
oauth_device_sso.py shrinks to a thin re-mount file: same legacy bp
with attach_anti_framing applied, four bp.add_url_rule() calls binding
the legacy paths to the imported view functions. Same handler runs
for both mounts — no duplicated logic.
attach_anti_framing(openapi_bp) added in controllers/openapi/__init__.py
so X-Frame-Options + frame-ancestors CSP cover the canonical paths too.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
DeviceApproveApi + DeviceDenyApi (cookie-authed) move to
controllers/openapi/oauth_device/{approve,deny}.py. Decorator stack
preserved verbatim: setup_required → login_required →
account_initialization_required → bearer_feature_required →
rate_limit. Audit event names ('oauth.device_flow_approved' /
'oauth.device_flow_denied') unchanged so the OTel exporter
registration keeps routing them.
The legacy /console/api/oauth/device/{approve,deny} mounts are
re-registered on console_ns from the bottom of the new files via a
local-import _register_legacy_console_mount() helper. The local
import breaks an import cycle that would otherwise form: openapi
imports console.wraps for setup_required, console.__init__.py imports
console.auth.oauth_device, which would re-import the openapi class
mid-load. Deferring console_ns past the class definition resolves it.
console/auth/oauth_device.py becomes a 9-line placeholder (the
existing console.__init__.py `from .auth import (..., oauth_device,
...)` keeps loading until Phase F prunes the import).
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
GET /openapi/v1/account/sessions lists the bearer's active OAuth
tokens (filtered to revoked_at IS NULL, expires_at > NOW(), token_hash
IS NOT NULL — no phantom devices). DELETE
/openapi/v1/account/sessions/<id> revokes a specific session with a
subject-match guard that returns 404 (not 403) on cross-subject so
token IDs don't leak across subjects.
Subject scoping abstracted into _subject_match(ctx): account subjects
filter by account_id; external_sso subjects filter by (email, issuer)
AND account_id IS NULL — preventing an SSO bearer from touching a
same-email account row from a federated tenant.
_revoke_token_by_id helper extracted so /sessions/self and
/sessions/<id> share the same UPDATE-where-revoked_at-IS-NULL
idempotent revoke + Redis cache invalidation.
No /v1/ equivalents — these are new endpoints (spec §Sessions list shape).
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
GET /v1/me moves to GET /openapi/v1/account. DELETE
/v1/oauth/authorizations/self moves to DELETE
/openapi/v1/account/sessions/self. Both classes (AccountApi,
AccountSessionsSelfApi) are now in controllers/openapi/account.py and
re-registered on service_api_ns at the legacy paths.
service_api/oauth.py is now nothing but legacy re-mount declarations
(20 lines). All in-place handler logic has moved to openapi/. Phase F
will delete the file and the legacy mounts together.
Helper functions (_load_memberships, _pick_default_workspace,
_workspace_payload, _account_payload) move with the AccountApi class.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
Same pattern as B.6 / B.7: OAuthDeviceLookupApi moves to
controllers/openapi/oauth_device/lookup.py and is re-registered on
service_api_ns to keep /v1/oauth/device/lookup serving until Phase F.
service_api/oauth.py is now down to /me + /oauth/authorizations/self
plus three legacy mounts; remaining handlers move in Phase C.
Now-unused imports (LIMIT_LOOKUP_PUBLIC, rate_limit, reqparse, request,
DEVICE_FLOW_TTL_SECONDS, DeviceFlowRedis, DeviceFlowStatus) removed.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
Same pattern as B.6: OAuthDeviceTokenApi moves to
controllers/openapi/oauth_device/token.py and is re-registered on
service_api_ns to keep /v1/oauth/device/token serving until Phase F.
_audit_cross_ip_if_needed helper moves with the handler. Now-unused
imports removed from service_api/oauth.py.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
Canonical class OAuthDeviceCodeApi now lives in
controllers/openapi/oauth_device/code.py and is registered on
openapi_ns at /openapi/v1/oauth/device/code. service_api/oauth.py
re-registers the same class object on service_api_ns at
/v1/oauth/device/code so existing callers keep working until Phase F.
KNOWN_CLIENT_IDS literal moves to dify_config.OPENAPI_KNOWN_CLIENT_IDS
(CSV-parsed, default "difyctl") so new CLIs / SDKs can be admitted
without code changes (CLAUDE.md rule 8 — no magic strings).
_verification_uri helper moves with the handler. Single source of
truth — no duplicated logic between the two mounts.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
OPENAPI_CORS_ALLOW_ORIGINS env var defaults to empty (same-origin only).
Operators expand for third-party integrations via comma-separated list.
Allowed headers: Authorization, Content-Type, X-CSRF-Token. Methods:
GET POST PATCH DELETE OPTIONS. Max-Age 600s. supports_credentials=True
so cookie-authed approve/deny work once Phase D moves them in.
Disallowed origins receive a normal 200 OPTIONS response without the
Access-Control-Allow-Origin header — flask-cors's standard behavior;
browser blocks the cross-origin request from the disallowed origin.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
Route-level scope gate; pairs with validate_bearer. Bearer holding the
catch-all SCOPE_FULL ('full', carried by dfoa_) passes any check;
narrower bearers (dfoe_, future PATs) need the exact scope listed in
the route decorator.
No v1.0 route applies it yet — apps/datasets controllers will be the
first consumers when those plans land. Programming-error guard: if
@require_scope runs without @validate_bearer above it, raises
RuntimeError instead of silently allowing.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
The decorator was defined inline in console/auth/oauth_device.py. Phase
D will move approve/deny to controllers/openapi/oauth_device/ and the
new SSO branch under the same group needs the same gate. Hoist it to
libs/oauth_bearer.py now so the move stays a pure file rename later.
Behavior unchanged: 503 'bearer_auth_disabled' when ENABLE_OAUTH_BEARER
is off. console/auth/oauth_device.py imports it from libs and drops
the now-unused dify_config / wraps / ServiceUnavailable imports.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
Accepts.APP and the matching app- short-circuit existed to let routes
declare "I accept either OAuth or app- tokens", but no production
caller ever did, and the short-circuit returned without doing the
tenant/app/end-user setup that app- tokens actually need (that lives
in service_api/wraps.py:validate_app_token).
After this change, validate_bearer is OAuth-only. app- bearers fall
through the prefix dispatch and surface as InvalidBearer -> 401, which
is what we already promised on /openapi/* (no app- accepted) and what
the docstring claimed all along.
Pre-check rg "Accepts\\.APP" returned zero hits outside the function
being edited; no callers to update.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
New Flask blueprint at /openapi/v1/ that will host user-scoped
programmatic endpoints (device flow, identity, sessions, workspaces).
Ships only a smoke route GET /openapi/v1/_health for now; subsequent
phases lift handlers in from service_api, console, and the orphan
oauth_device_sso.py.
CORS is intentionally omitted here and configured in step A.5 once
the allowlist envvar lands.
Plan: docs/superpowers/plans/2026-04-26-openapi-migration.md (in difyctl repo).
- api: account-flow stores subject_issuer="dify:account" sentinel
instead of NULL so the rotate-in-place unique index collides as
intended (Postgres treats NULLs as distinct in unique indices).
mint_oauth_token validates prefix-specific issuer rules.
- api: enterprise_only inverts to an allowlist (ACTIVE / EXPIRING) so
any future LicenseStatus value defaults to denial.
- api: consume_on_poll moved to a single Lua script (GET + status-check
+ DEL) so concurrent pollers can't both observe APPROVED.
- web: typed DeviceFlowError + central error-copy mapping; page
surfaces rate_limited / lookup_failed view states; URL params
scrubbed after consumption (RFC 8628 §5.4).
Adds a CLI-friendly authorization flow so difyctl (and future
non-browser clients) can obtain user-scoped tokens without copy-
pasting cookies or raw API keys. Two grant paths share one device
flow surface:
1. Account branch — user signs in via the existing /signin
methods, /device page calls console-authed approve, mints a
dfoa_ token tied to (account_id, tenant).
2. External-SSO branch (EE) — /v1/oauth/device/sso-initiate signs
an SSOState envelope, hands off to Enterprise's external ACS,
receives a signed external-subject assertion, mints a dfoe_
token tied to (subject_email, subject_issuer).
API surface (all under /v1, EE-only endpoints 404 on CE):
POST /v1/oauth/device/code — RFC 8628 start
POST /v1/oauth/device/token — RFC 8628 poll
GET /v1/oauth/device/lookup — pre-validate user_code
GET /v1/oauth/device/sso-initiate — SSO branch entry
GET /v1/device/sso-complete — SSO callback sink
GET /v1/oauth/device/approval-context — /device cookie probe
POST /v1/oauth/device/approve-external — SSO approve
GET /v1/me — bearer subject lookup
DELETE /v1/oauth/authorizations/self — self-revoke
POST /console/api/oauth/device/approve — account approve
POST /console/api/oauth/device/deny — account deny
Core primitives:
- libs/oauth_bearer.py: prefix-keyed TokenKindRegistry +
BearerAuthenticator + validate_bearer decorator. Two-tier scope
(full vs apps:run) stamped from the registry, never from the DB.
- libs/jws.py: HS256 compact JWS keyed on the shared Dify
SECRET_KEY — same key-set verifies the SSOState envelope, the
external-subject assertion (minted by Enterprise), and the
approval-grant cookie.
- libs/device_flow_security.py: enterprise_only gate, approval-
grant cookie mint/verify/consume (Path=/v1/oauth/device,
HttpOnly, SameSite=Lax, Secure follows is_secure()), anti-
framing headers.
- libs/rate_limit.py: typed RateLimit / RateLimitScope dispatch
with composite-key buckets; both decorator + imperative form.
- services/oauth_device_flow.py: Redis state machine (PENDING ->
APPROVED|DENIED with atomic consume-on-poll), token mint via
partial unique index uq_oauth_active_per_device (rotates in
place), env-driven TTL policy.
Storage: oauth_access_tokens table with partial unique index on
(subject_email, subject_issuer, client_id, device_label) WHERE
revoked_at IS NULL. account_id NULL distinguishes external-SSO
rows. Hard-expire is CAS UPDATE (revoked_at + nullify token_hash)
so audit events keep their token_id. Retention pruner DELETEs
revoked + zombie-expired rows past OAUTH_ACCESS_TOKEN_RETENTION_DAYS.
Frontend: /device page with code-entry, chooser (account vs SSO),
authorize-account, authorize-sso views. SSO branch detaches from
the URL user_code and reads everything from the cookie via
/approval-context. Anti-framing headers on all responses.
Wiring: ENABLE_OAUTH_BEARER feature flag; ext_oauth_bearer binds
the authenticator at startup; clean_oauth_access_tokens_task
scheduled in ext_celery.
Spec: docs/specs/v1.0/server/{device-flow,tokens,middleware,security}.md
