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auth/authmw/bag_enricher.go

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feat(auth): initial implementation — authmw and rbac (v1.0.0) Introduces code.nochebuena.dev/einherjar/auth — the provider-agnostic HTTP authentication and authorization layer of the Einherjar framework. Absorbs two micro-lib packages (httpauth, rbac) as sub-packages, replacing the Identity-only context model with a SecurityBag-native design and adding a composable enrichment chain. authmw: - BagEnricher function type — enriches the request-scoped SecurityBag after the base Identity is built; registered via WithBagEnricher; multiple enrichers run in order, each receiving the bag from the previous - IdentityEnricher interface — application-layer contract for loading user data from uid+claims - EnrichmentMiddleware — builds SecurityBag from uid+claims, runs enricher chain, stores via security.SetBagInContext; 401 on missing uid, 500 on enricher error; routes all errors through httputil.Error - AuthzMiddleware — per-route permission gate; 401 on missing identity, 403 on provider error (fail-closed) or insufficient permissions - EnrichOpt type + WithTenantHeader (reads TenantID from header, implemented as a BagEnricher) + WithBagEnricher (registers custom enrichers for hardware IDs, grant codes, or any bag attribute) - SetTokenData / GetClaims — integration contract for auth-jwt / auth-firebase rbac: - NewClaimsPermissionProvider — reads flat JWT claim bitmasks from context; wildcard "*" fallback; handles int64/float64/json.Number; zero DB calls - NewCachedPermissionProvider — TTL cache wrapping any PermissionProvider; default key "rbac:{uid}:{resource}" or "rbac:{tenantID}:{uid}:{resource}"; TenantID sourced from SecurityBag automatically; accepts ...CachedOpt - CachedOpt type + WithCacheKey — overrides the key function for extra dimensions (hardware IDs, grant codes read from bag attributes) - NewChainPermissionProvider — tries providers in order; first non-zero wins; errors short-circuit; typical pattern: claims → cached DB fallback - Cache interface — pluggable backend satisfied by cache-valkey via duck typing Compliance test (package auth_test) enforces CT-6 (≤1 exported TypeSpec/file), compile-time interface satisfaction, and behavioural coverage across the full middleware and provider surface: enrichment success/failure, tenant header, custom BagEnricher, bag-in-context, authz allowed/denied/error, claims hit/wildcard/missing/float64, cached hit/miss/error/tenant-key/custom-key, chain first-non-zero/fallthrough/error. Depends on contracts v1.0.0, core v1.0.0, web v1.0.0. - identifiable.go: package-level Module variable (observability.Identifiable) for version identification — auth is middleware-only; not registered with the launcher
2026-05-29 16:11:21 +00:00
package authmw
import (
"net/http"
"code.nochebuena.dev/einherjar/contracts/security"
)
// BagEnricher enriches the request-scoped SecurityBag.
//
// Called sequentially by [EnrichmentMiddleware] after the base Identity is
// built from uid+claims. Each enricher receives the current bag and must
// return a new bag — the receiver is never modified.
//
// Typical uses: setting TenantID from a request header, attaching a hardware
// ID to the bag, injecting a grant code from an out-of-band lookup.
//
// Register enrichers via [WithBagEnricher]. [WithTenantHeader] is a
// convenience constructor for the most common single-header case.
type BagEnricher func(bag security.SecurityBag, r *http.Request) security.SecurityBag