81 lines
2.1 KiB
Go
81 lines
2.1 KiB
Go
package middleware
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import (
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"context"
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"encoding/json"
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"net/http"
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"strings"
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"github.com/bridge/ai-customer-service/internal/domain/error/cserrors"
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)
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const (
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HeaderActorID = "X-CS-Actor-ID"
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HeaderActorRole = "X-CS-Actor-Role"
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)
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type Actor struct {
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ID string
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Role string
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}
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type actorContextKey struct{}
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func WithActor(ctx context.Context, id, role string) context.Context {
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return context.WithValue(ctx, actorContextKey{}, Actor{
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ID: strings.TrimSpace(id),
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Role: normalizeRole(role),
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})
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}
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func ActorFromContext(ctx context.Context) (Actor, bool) {
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actor, ok := ctx.Value(actorContextKey{}).(Actor)
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if !ok {
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return Actor{}, false
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}
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if strings.TrimSpace(actor.ID) == "" || strings.TrimSpace(actor.Role) == "" {
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return Actor{}, false
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}
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return actor, true
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}
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// RequireRoles enforces RBAC allow-listing. It does NOT authenticate the actor headers.
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// SECURITY: This middleware trusts the upstream gateway to authenticate the actor headers.
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// In production, an API Gateway or JWT middleware must run before this layer.
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func RequireRoles(next http.Handler, allowedRoles ...string) http.Handler {
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allowed := make(map[string]struct{}, len(allowedRoles))
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for _, role := range allowedRoles {
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if normalized := normalizeRole(role); normalized != "" {
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allowed[normalized] = struct{}{}
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}
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}
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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actorID := strings.TrimSpace(r.Header.Get(HeaderActorID))
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role := normalizeRole(r.Header.Get(HeaderActorRole))
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if actorID == "" || role == "" {
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writeAccessDenied(w)
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return
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}
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if _, ok := allowed[role]; !ok {
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writeAccessDenied(w)
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return
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}
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next.ServeHTTP(w, r.WithContext(WithActor(r.Context(), actorID, role)))
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})
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}
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func normalizeRole(role string) string {
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return strings.ToLower(strings.TrimSpace(role))
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}
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func writeAccessDenied(w http.ResponseWriter) {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusForbidden)
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_ = json.NewEncoder(w).Encode(map[string]any{
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"error": map[string]any{
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"code": cserrors.CS_AUTH_4001,
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"message": cserrors.ErrorMsg(cserrors.CS_AUTH_4001),
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},
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})
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}
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