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shankar0123
cd374b243e
Phase 9 ARCH-M2 closure Sprint 11. Splits
internal/api/handler/auth_session_oidc.go (was 1577 LOC, the
fifth-largest backend hotspot from the original audit) via the
Option B sibling-file pattern — new files stay in `package handler`
so every external caller of
`handler.AuthSessionOIDCHandler.{LoginInitiate, LoginCallback,
BackChannelLogout, Logout, ListSessions, RevokeSession,
RevokeAllExceptCurrent, ListProviders, CreateProvider,
UpdateProvider, DeleteProvider, TestProvider, RefreshProvider,
ListGroupMappings, AddGroupMapping, RemoveGroupMapping}` and
`handler.{DefaultBCLVerifier, NewDefaultBCLVerifier,
DefaultBCLVerifierMaxAge}` resolves the same way. Pure mechanical
relocation; no signature, no behavior, no import-graph change.
Section-based split (Option B + audit's verb prescription)
==========================================================
The audit's Tasks-Deferred row prescribed splitting "per handler
verb (login / callback / refresh / logout / backchannel)." The
file itself documents a three-section layout in its package
doc-comment:
1. Public OIDC handshake (auth-exempt)
2. Session management (RBAC-gated)
3. OIDC provider + group-mapping CRUD (RBAC-gated)
Going strictly verb-by-verb would have:
- mis-grouped RefreshProvider (which is an ADMIN op on a
provider's signing-key cache, not a session refresh — same
auth.oidc.edit permission as Update/Delete);
- split LoginInitiate + LoginCallback into separate files
despite them sharing the state cookie + pre-login row flow;
- left the other 9 handlers (Sessions, Provider CRUD, Group
Mappings) with no obvious home.
Sprint 11 follows the file's own self-described section split
plus a fourth file for the DefaultBCLVerifier, which the original
file already kept under a separate banner.
What moved
==========
New `internal/api/handler/auth_session_oidc_handshake.go` (391 LOC)
— Section 1 / Public OIDC handshake handlers (auth-exempt):
- LoginInitiate (GET /auth/oidc/login?provider=<id>)
- LoginCallback (GET /auth/oidc/callback?code=...&state=...)
- BackChannelLogout (POST /auth/oidc/back-channel-logout)
- Logout (POST /auth/logout)
New `internal/api/handler/auth_session_oidc_sessions.go` (208 LOC)
— Section 2 / Session-management handlers (RBAC-gated):
- sessionResponse projection type + sessionToResponse mapper
- ListSessions (GET /api/v1/auth/sessions)
- RevokeSession (DELETE /api/v1/auth/sessions/{id})
- RevokeAllExceptCurrent
(DELETE /api/v1/auth/sessions/all-except-current)
New `internal/api/handler/auth_session_oidc_crud.go` (470 LOC) —
Section 3 / OIDC provider + group-mapping CRUD (RBAC-gated):
- oidcProviderResponse + oidcProviderRequest projection types,
providerToResponse mapper
- ListProviders / CreateProvider / UpdateProvider /
DeleteProvider / TestProvider / RefreshProvider
- groupMappingResponse + groupMappingRequest projection types,
mappingToResponse mapper
- ListGroupMappings / AddGroupMapping / RemoveGroupMapping
New `internal/api/handler/auth_session_oidc_bcl.go` (225 LOC) —
DefaultBCLVerifier (handler's default implementation of the
BackChannelLogoutVerifier interface declared in
auth_session_oidc.go):
- DefaultBCLVerifierMaxAge constant
- DefaultBCLVerifier struct + NewDefaultBCLVerifier
- WithMaxAge builder
- Verify (the OpenID Connect Back-Channel Logout 1.0 §2.6
verification: events claim, iat window, algorithm allowlist,
audience match, sub/sid/jti decode)
- peekIssuer unexported helper
What stays in auth_session_oidc.go (452 LOC, down from 1577)
============================================================
- Package + import block.
- Service-layer interface projections (OIDCAuthHandshaker,
SessionMinter, BackChannelLogoutVerifier) — declared once and
consumed by every section.
- SessionCookieAttrs config struct.
- AuthSessionOIDCHandler struct + permissionChecker /
BCLReplayConsumer / AuditRecorder interfaces + NewAuthSession-
OIDCHandler constructor + the WithPermissionChecker /
WithBCLReplayConsumer builder methods.
- The shared helpers consumed across multiple sections:
encryptClientSecret, recordAudit, clearPreLoginCookie,
clearSessionCookies, clientIPFromRequest, classifyOIDCFailure,
randomB64URLForHandler, defaultIfBlank, defaultIntIfZero.
Side-effect import cleanup
==========================
Four imports drop from auth_session_oidc.go as a clean side effect
of the cut:
- "encoding/json" (used only in CRUD + BCL — moved out)
- "fmt" (used only in BCL — moved out)
- gooidc "github.com/coreos/go-oidc/v3/oidc"
(used only in BCL — moved out)
- oidcdomain "github.com/certctl-io/certctl/internal/auth/oidc/domain"
(used in handshake + CRUD + BCL — moved out)
Per-import audit on every new sibling file is in the commit's diff:
each carries only the imports its extracted code actually consumes.
Net effect
==========
auth_session_oidc.go: 1577 → 452 LOC (-1,125 = -71.3%). Four new
sibling files at 1,294 LOC total (1,125 moved + ~169 of header +
Phase 9 doc-comment overhead). The original hotspot drops below
the cmd/agent/main.go target for Sprint 12 (1489 LOC).
Cumulative Phase 9 progress (top 5 hotspots)
============================================
config.go 3403 → 1342 (-60.6%, Sprints 1-7)
cmd/server/main.go 2966 → 2260 (-23.8%, Sprints 8 + 8b)
service/acme.go 1965 → 1162 (-40.9%, Sprints 9 + 9b)
mcp/tools.go 1867 → 109 (-94.2%, Sprint 10)
auth_session_oidc 1577 → 452 (-71.3%, Sprint 11)
TOTAL across 5 files: 11,778 → 5,325 LOC = -6,453 (-54.8%)
Behavior preservation contract
==============================
1. gofmt -l clean across all 5 affected files.
2. go vet ./internal/api/handler/... — no findings.
3. staticcheck ./internal/api/handler/... — no findings.
4. go test -short -count=1 ./internal/api/handler/... — green
(includes the 1,439-line auth_session_oidc_test.go suite that
pins every moved handler's behavior including BCL replay,
CSRF rotation, audit emission, and the Phase-5 RBAC path).
5. Broader-importer build green: go build ./... .
6. Broader-importer tests green: go test -short -count=1
./cmd/server/... ./internal/api/router/... .
cmd/server/main.go consumes handler.DefaultBCLVerifier +
handler.NewDefaultBCLVerifier + handler.DefaultBCLVerifierMaxAge
across three call sites; all three resolve unchanged through Go's
same-package public-export mechanism (the type + constructor
moved to a sibling file in the same `handler` package). The
mcp/tools_auth_bundle2.go comment string referencing
"oidcProviderRequest" is descriptive prose, not an import.
What remains for Phase 9
========================
One sibling-file split queued:
- Sprint 12: cmd/agent/main.go (1489 LOC) → main + poll +
deploy + register sibling files in same cmd/agent package
(mirrors the cmd/server pattern from Sprints 8 + 8b).
Refs: ARCH-M2 (god-files), Phase 9 audit. Sprint 11 closes the
auth-session-OIDC handler hotspot from the audit's top-5 list.