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auth/authmw/token.go

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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 "context"
type ctxUIDKey struct{}
type ctxClaimsKey struct{}
// SetTokenData stores uid and token claims in context.
// Called by provider-specific AuthMiddleware (auth-jwt, auth-firebase) after
// token verification. EnrichmentMiddleware reads these values downstream.
func SetTokenData(ctx context.Context, uid string, claims map[string]any) context.Context {
ctx = context.WithValue(ctx, ctxUIDKey{}, uid)
ctx = context.WithValue(ctx, ctxClaimsKey{}, claims)
return ctx
}
func getUID(ctx context.Context) (string, bool) {
v, ok := ctx.Value(ctxUIDKey{}).(string)
return v, ok && v != ""
}
// GetClaims returns the raw token claims stored by SetTokenData.
// Returns nil if SetTokenData was not called on this context.
// Useful for custom IdentityEnricher implementations and ClaimsPermissionProvider.
func GetClaims(ctx context.Context) map[string]any {
v, _ := ctx.Value(ctxClaimsKey{}).(map[string]any)
return v
}
func getClaims(ctx context.Context) map[string]any { return GetClaims(ctx) }